Explaining climate change science & rebutting global warming misinformation
Global warming is real and human-caused. It is leading to large-scale climate change. Under the guise of climate "skepticism", the public is bombarded with misinformation that casts doubt on the reality of human-caused global warming. This website gets skeptical about global warming "skepticism".
Our mission is simple: debunk climate misinformation by presenting peer-reviewed science and explaining the techniques of science denial, discourses of climate delay, and climate solutions denial.
Posted on 16 July 2025 by Guest Author
The videos include personal musings and conclusions of the creators climate scientist Dr. Adam Levy and geologist Dr. Rachel Phillips. They are presented to our readers as an informed perspective. Please see video descriptions for references (if any).
Adam Levy and Rachel Phillips collaborated on two videos for their respective Youtube channels explaining the study A 485-million-year history of Earth’s surface temperature published by Emily J. Judd and colleagues in 2024.
Today's climate is changing. Fast. But what has happened in our planet's past? Have climate changes taken place long ago? In fact, there have been huge shifts in the planet's climate over the past hundreds of millions of years - from ice ages to temperatures far hotter than today. These have been triggered by everything from the evolution of plants to the asteroid that wiped out the dinosaurs. But throughout all this, there's one familiar variable: carbon dioxide. So what do the past half billion years reveal? And what does that mean for the climate change we're seeing today?
Adam's video:
Rachel's video:
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Posted on 15 July 2025 by Sue Bin Park
Skeptical Science is partnering with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. You can submit claims you think need checking via the tipline.
Did CO2 contribute to early 20th century warming?
Warming from 1920 to 1940 was influenced by both natural dynamics or “forcings” as well as human-caused greenhouse gas emissions such as CO2.
Human-caused CO2 began rising during the Industrial Revolution and contributed to early 20th century warming. At the same time, solar activity rose slightly and volcanic activity was unusually low, adding to warming. Ocean circulation changes also raised regional temperatures in areas like the North Atlantic.
The myth that early warming disproves CO2’s role in climate change ignores that scientists account for all major forcings. Studies estimate that without human emissions, only about half the early 20th-century warming would have occurred.
Since 1975, solar activity has declined and volcanic eruptions have cooled the atmosphere, yet global temperatures have surged alongside the steep rise in greenhouse gas emissions. Only models that include CO2 match observed warming trends. Natural variability alone cannot explain the industrial era increase in global temperatures.
Go to full rebuttal on Skeptical Science or to the fact brief on Gigafact
This fact brief is responsive to quotes such as this one.
Sources
NOAA Climate Change in the Context of Paleoclimate
NASA Carbon Dioxide
Wiley Interdisciplinary Review Climate Change The early 20th century warming: Anomalies, causes, and consequences
NASA The Causes of Climate Change
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Posted on 14 July 2025 by Guest Author
This is a re-post from The Climate Brink by Andrew Dessler
My heart is breaking for the tragedy that’s unfolding in central Texas right now. At present, more than 70 people have died in the flooding in the Texas Hill Country.
Given the widespread interest in this event and numerous requests for comment from the media, I’ve compiled the essential points you need to know here.
I’ve written about the influence of climate change in intense precipitation events before, and here’s what I said:
Let me emphasize up front that climate change doesn’t cause rain events. Rather, the role of climate change is like steroids for the weather — it injects an extra dose of intensity into existing weather patterns. So the right question is whether climate change has amped up this event.
Warmer air can hold more water vapor — about 7% more for every degree Celsius increase in temperature. Consequently, the air converging into a storm system in a warmer climate carries more water vapor. Since most of the water vapor entering the storm’s updraft will fall out as rain, everything else the same, more water in the air flowing into the storm will lead to more intense rainfall. That’s it. Not terribly complicated.
Obviously, not everything else has to stay the same. Things like the vertical velocity and the temperature profile can both change and that could modify the rate at which intense rainfall is getting more intense. See this paper for a complete discussion of these other factors. Considering all of the factors yields a very similar conclusion.
can we see this in observations? yes!
When it comes to flooding, the rain events we care about are the most intense. And this plot shows the observed frequency of occurrence of these rain events in two periods, the mid-20th century and the late-20th/early-21st century. As you can see, the heaviest events (above 99th percentile) are indeed becoming more intense.
what does the scientific community conclude?
Because of this, the IPCC’s synthesis report concluded:
The frequency and intensity of heavy precipitation events have increased since the 1950s over most land areas for which observational data are sufficient for trend analysis (high confidence), and human-caused climate change is likely the main driver.
They go on to say that:
The projected increase in frequency and intensity of heavy precipitation (high confidence) will increase rain-generated local flooding (medium confidence).
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Posted on 13 July 2025 by BaerbelW, Doug Bostrom
A listing of 29 news and opinion articles we found interesting and shared on social media during the past week: Sun, July 6, 2025 thru Sat, July 12, 2025.
Stories we promoted this week, by category:
Climate Change Impacts (6 articles)
- DeBriefed 4 July 2025: Trump `megabill` guts clean energy; Europe`s record heat; Scientists discuss `most worrying` tipping points Carbon Brief, Carbon Brief Staff, Jul 04, 2025.
- Devastating flash floods slam Texas Hill Country; Tropical Storm Chantal heads for Carolinas Yale Climate Connections, Jeff Masters and Bob Henson, Jul 05, 2025.
- Update on Texas flooding Andrew Dessler's update on the flooding in Texas The Climate Brink, Andrew Dessler, Jul 07, 2025.
- Experts: Which climate tipping point is the most concerning? Last week, hundreds of scientists, policymakers and journalists flocked to the University of Exeter to attend an international conference on “tipping points”. Carbon Brief, Carbon Brief Staff, Jul 09, 2025.
- London heatwave killed 263 people - with climate crisis to blame for most, study says Study finds around 1,500 of the 2,300 estimated heat deaths in Europe during recent weeks were the result of the climate crisis The Independent News, Jabed Ahmed, Jul 09, 2025.
- I’m a Climate Scientist in Texas. Here’s What the Floods Tell Us Time, Katharine Hayhoe, July 10, 2025.
Climate Policy and Politics (6 articles)
- Chinese Chickens Coming to Roost for Climate Denying Republicans Peter Sinclair teases apart the illogic of the US administration's attitude to energy modernization, and how it leads to a generous geopolitical gift. This is Not Cool, greenman3610, Jul 04, 2025.
- The "green" corporations funding anti-climate groups HEATED reached out to five companies with strong public climate commitments to find out why they're still funding major climate policy obstructors. HEATED, Casey Quinlan, Jul 07, 2025.
- Trump Hires Scientists Who Doubt the Consensus on Climate Change The three scientists joined the administration after it dismissed hundreds of experts who were assessing how global warming is affecting the country. NYT, Maxine Joselow, Jul 08, 2025.
- Recipients of a U.S. Climate Science Fellowship Are Put on Unpaid Leave Researchers in the NOAA program were furloughed because funds to pay them were not available. NYT, Rebecca Dzombak, Jul 09, 2025.
- Abbott says megafloods are "just part of nature." The fossil fuel industry disagrees. In leaked audio from a meeting last month, gas industry representatives acknowledged that extreme weather is getting wackier and more dangerous. HEATED, Emily Sanders, Jul 10, 2025.
- Trump officials axed an online portal for its key climate report. Read it in full here Guardian makes legally mandated gold standard report widely available after administration deleted website The Guardian, Oliver Milman, Jul 10, 2025.
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Posted on 10 July 2025 by Doug Bostrom, Marc Kodack
Open access notables
Americans and policymakers underestimate endorsement for the most popular climate solution narrative, combining personal and political action, Sparkman et al., Communications Earth & Environment
A wide variety of existing narratives describe how we might address climate change. Which of these approaches is popular among the American public? Do the general public and their elected officials accurately perceive which climate solutions are popular? We assess personal endorsement and perceptions of public support in national representative samples of the U.S. public (N = 1500) and local-level U.S. policymakers (N = 500). Proactive narratives, like ones advocating for both personal behavior and policy action, are widely endorsed, but both the public and policymakers greatly underestimate their popularity (a case of pluralistic ignorance), especially for narratives calling for systemic change. Greater endorsement of these narratives corresponded to greater willingness to take personal and political actions and support climate policy. We also find experimental exposure to some climate narratives (N = 2060) may increase participants’ behavioral intentions and policy support, suggesting which narratives are spread in popular media is important to help address climate change.
The work was supported by a National Science Foundation grant, SES-DRMS 2018063 to E.U.W.
The carbon perception gap in actual and ideal carbon footprints across wealth groups, Köchling et al., Nature Communications
Carbon inequality is gaining attention in public discussions surrounding equitable climate policies. It commonly refers to the unequal distribution of individual greenhouse gas emissions, with wealthier individuals contributing disproportionately higher emissions. Little is known about how people perceive the actual carbon footprint distribution across wealth groups and what they would desire as an ideal distribution. Survey data from Germany show awareness of carbon inequality, with respondents recognizing that wealthier individuals emit disproportionately more. Yet, with surprising consensus, all groups, including the wealthy, desired an inverse ideal distribution, with the wealthy having disproportionately smaller carbon footprints. Nonetheless, most perceived their own carbon footprint as far better compared to others in society and within their wealth group. Here, we show a carbon perception gap, particularly among the wealthiest: Collectively, people acknowledge the presence of carbon inequality and desire a more equitable distribution, yet often perceive themselves as already contributing more than others.
Permafrost Thaw Impact on Remaining Carbon Budgets and Emissions Pathways in 2°C and 3°C Global Warming Scenarios, Georgievski et al., Earth's Future
This study focuses on the impact of thawing frozen ground of high northern latitudes, known as permafrost, which contains large amount of soil organic carbon (SOC). As temperatures rise due to climate change, this SOC can be decomposed and released as greenhouse gases (GHG) into atmosphere reinforcing warming. We use climate model experiments with and without permafrost, adapting fossil fuel emissions to simulate different scenarios aimed at limiting GHG concentrations to stabilize global warming to 2°C and 3°C above preindustrial levels. Climate model simulations show that thawing permafrost could release significant amounts of GHG with temporary peaks of about half of present-day annual fossil fuel emissions (∼5 PgC), but at an average rate of less than 0.7 PgC/yr for 3°C, and ∼0.3 PgC/yr for 2°C warming. Thus, by the end of the simulations set for the year 2298, the release of permafrost carbon reduces the amount of carbon available for fossil fuel emissions by ∼13% for 2°C warming level, and by ∼11% for 3°C warming level. These results show how important it is to consider permafrost thaw when acting to reduce emissions.
Rapid increases in satellite-observed ice sheet surface meltwater production, Zheng et al., Nature Climate Change
Surface meltwater production influences the contribution of ice sheets to global sea-level change. Ice-sheet-wide meltwater production has thus far primarily been quantified by regional climate models. Here we present a 31-year (1992–2023) time series of daily satellite-observed surface melt flux for the Greenland and Antarctic ice sheets. The annual meltwater volume in Greenland has significantly increased, with intensified melt in the northern basins dominated by a negative North Atlantic Oscillation and elevated melt flux in western basins driven by the decline in Arctic sea-ice. In East Antarctica, high melt rates since 2000 are attributed to warm air incursions from the Southern Ocean due to anomalous atmospheric circulations associated with a negative Southern Annular Mode and the recovery of the Antarctic ozone hole. This region, previously less prone to surface melt, has become a melt hotspot, potentially leading to meltwater ponding and future ice shelf destabilization.
Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites, Silvano et al., Proceedings of the National Academy of Sciences
For decades, the surface of the polar Southern Ocean (south of 50°S) has been freshening—an expected response to a warming climate. This freshening enhanced upper-ocean stratification, reducing the upward transport of subsurface heat and possibly contributing to sea ice expansion. It also limited the formation of open-ocean polynyas. Using satellite observations, we reveal a marked increase in surface salinity across the circumpolar Southern Ocean since 2015. This shift has weakened upper-ocean stratification, coinciding with a dramatic decline in Antarctic sea ice coverage. Additionally, rising salinity facilitated the reemergence of the Maud Rise polynya in the Weddell Sea, a phenomenon last observed in the mid-1970s. Crucially, we demonstrate that satellites can now monitor these changes in real time, providing essential evidence of the Southern Ocean’s potential transition toward persistently reduced sea ice coverage.
From this week's government/NGO section:
Climate Change in the American Mind: Beliefs & Attitudes, Spring 2025, Leiserowitz et al., Yale University and George Mason University
Americans who think global warming is happening outnumber those who think it is not by a ratio of more than 4 to 1 (69% versus 15%). Compared with Fall 2024, Americans’ level of worry is significantly higher for wildfires (+12 percentage points), rising sea levels (+13 points), and hurricanes (+8 points). Additionally, half or more Americans are at least “a little worried” their local area might be harmed by air pollution (78%), water pollution (77%), diseases carried by mosquitoes and ticks (76%), extreme heat (73%), droughts (73%), agricultural pests and diseases (71%), electricity power outages (71%), wildfires (67%), water shortages (67%), flooding (61%), tornados (60%), rising sea levels (55%), hurricanes (50%), and reduced snowpack (49%). Nearly two-thirds of Americans think that global warming is affecting the weather in the U.S. (64%), and seven in ten or more think it is affecting extreme heat (75%), wildfires (72%), droughts (72%), and flooding (71%). Only 18% of Americans say they hear about global warming in the media “at least once a week,” which is the lowest percentage since the question was added to the survey in 2015.
Google’s Eco-failures. An Environmental Investigation into Alphabet Inc. 2025, Kairos Fellowship
Google’s reported total greenhouse gas emissions increased 1,515% from 2010 to 2024 according to the company’s own published data. While Google reports a decrease in its data center emissions, it is doing so by only reporting “market based emissions,” which use renewable energy purchased elsewhere to obscure real emissions. Google’s only emissions that have shown an absolute decrease since 2019 are its scope 1 emissions, which merely account for 0.31% of Google’s reported total emissions. Google’s aggressive investment in Generative AI and its infrastructure is a major factor behind its climate failings. Google’s Scope 2 emissions, which measure the emissions from energy that Google purchases to power its data centers, have increased by 820% since 2010.
118 articles in 58 journals by 625 contributing authors
Physical science of climate change, effects
Dynamical Systems Methods to Understand Projected Heatwave Intensification, Vakrat & Kushner Kushner, Weather and Climate Extremes Open Access 10.1016/j.wace.2025.100791
Heat Storage Pattern Linked to the Atlantic Meridional Overturning Circulation Slowdown, Ren et al., Geophysical Research Letters Open Access 10.1029/2025gl116801
Observations of climate change, effects
Divergent oxygen trends in ice-covered lakes driven by ice-cover decline and ecological memory, Jansen et al., Proceedings of the National Academy of Sciences Open Access 10.1073/pnas.2426140122
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Posted on 9 July 2025 by dana1981
This is a re-post from Yale Climate Connections
On the Fourth of July – America’s 249th birthday – President Donald Trump signed into law a bill that could very well cede the country’s position as the leading global economic superpower to China.
As the nonpartisan energy think tank RMI has argued, the world is in the midst of a transition from the Information Age, which the United States led by dominating the development of new software and information technologies, to the Renewable Age, in which the development and deployment of electric and renewable energy technologies will drive the global economy.
This transition is dominated by insurgent clean technologies, such as solar, wind, electric vehicles, and batteries, whose prices are falling rapidly and whose growth is exponential.
Transitions to new global economic ages and the countries that led and are poised to lead them. (Image credit: RMI / used with permission)
Chinese manufacturers have invested heavily in those technologies. To help the U.S. economy better compete in the clean tech sector, Democrats passed the Inflation Reduction Act, or IRA, in August 2022. That law included incentives to spur domestic manufacturing of these key clean energy technologies.
And it was working.
The U.S. experienced a clean energy manufacturing boom over the ensuing two years. But Republicans’ new budget reconciliation law, called the “One, Big Beautiful Bill Act,” guts those incentives and pulls the rug out from under nascent domestic clean energy industries.
On America’s birthday, President Donald Trump could not have given the Chinese economy a more generous gift.
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Posted on 8 July 2025 by Sue Bin Park
Skeptical Science is partnering with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. You can submit claims you think need checking via the tipline.
Is global warming just due to El Niño?
El Niño Southern Oscillation is a short-term and cyclical weather phenomenon caused by alternating wind patterns that result in heat exchange between the ocean and the atmosphere; it cannot explain long-term warming.
El Niño originates when westward moving trade winds weaken, allowing warm surface waters to shift east across the tropical Pacific. This reverses the La Niña pattern, where trade winds push warm surface water toward Asia, upwelling cold water off the coast of South America.
During El Niño, heat is transferred from the ocean to the atmosphere, causing warming, while La Niña occurs when heat moves from the atmosphere to the ocean, causing cooling. Energy is moved around the climate system without adding any heat.
In contrast, climate science research indicates human-caused CO2 is the primary driver of today’s warming. Human activities that increase greenhouse concentrations in the atmosphere cause less heat to escape the atmosphere, resulting in additional and non-cyclical warming.
Go to full rebuttal on Skeptical Science or to the fact brief on Gigafact
This fact brief is responsive to quotes such as this one.
Sources
NOAA What is the El Niño–Southern Oscillation (ENSO) in a nutshell?
NOAA Can We Blame El Niño?
Journal of Geophysical Research Comment on “Influence of the Southern Oscillation on tropospheric temperature” by J. D. McLean, C. R. de Freitas, and R. M. Carter
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Posted on 7 July 2025 by Zeke Hausfather
This is a re-post from the Climate Brink
The publication of an article titled “The World Is Warming Up. And It’s Happening Faster” by the New York Times kicked off a pretty heated debate among climate scientists over the evidence of acceleration and how strong a claim can be made based on the evidence today.
The NYT included the illustrative figure below, which draws simple ordinary least squares trends over three time periods: 1880-1970, 1970-2010, and 2010-present (May 2025). It appears to show a notable acceleration over the past 15 years compared to the rate of warming that characterized the post-1970 “modern warm period” when climate change began to notably take off alongside human emissions of CO2 and other greenhouse gases.
However, 15 years is a relatively short period of time; while the timeseries currently ends just after a weak La Nina event, there are concerns that the strong El Nino of 2023/2024 could bias the trend upward. More broadly, there is a lingering spectre of the hiatus haunting these discussions, when the climate science community arguably over-indexed on short term variability to make too much of an apparent slowdown in global warming between 1998 and 2012.
So, is there real evidence of an acceleration, or are we failing to learn from the past and overhyping short-term variability?
As I discuss below, it is my view that this is structurally different from the debate during the hiatus years; not because the evidence is much stronger in the surface temperature record alone (though arguably it is), but because so many other lines of evidence – climate models, ocean heat content, and changes in earth energy imbalance – also suggest an acceleration.
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Posted on 6 July 2025 by BaerbelW, Doug Bostrom
A listing of 27 news and opinion articles we found interesting and shared on social media during the past week: Sun, June 29, 2025 thru Sat, July 5, 2025.
Stories we promoted this week, by category:
Climate Change Impacts (4 articles)
- What does climate change mean for agriculture? Less food, and more emissions New research sheds light on how rising temperatures are squeezing farmers and raising prices for consumers. Grist, Frida Garza, Jun 30, 2025.
- How unusual is this UK heat and is climate change to blame? A second spell of UK temperatures well over 30C before the end of June - how unusual is this and how much is climate change to blame? BBC News, Mark Poynting, Jun 30, 2025.
- Climate change has doubled the world's heat waves: How Africa is affected The Conversation, Joyce Kimutai, Jul 02, 2025.
- We didn’t know East Antarctica was melting like this Dr Gilbz on Youtube, Ella Gilbert, July 4, 2025.
Climate Education and Communication (4 articles)
- Stampede in Soho: puppet animals on an epic trek bring wonder and warning to London streets Public art project The Herds is passing through capital on 20,000km journey from Congo Basin to Arctic Circle, inspiring climate action The Guardian, Chris Wiegand, Jun 28, 2025.
- Schools failing in climate education A survey reveals a disconnect between what Canadian parents and kids want to know about climate change vs. how the need is addressed in schools. Brandon Sun, Karen S. Acton, Jun 30, 2025.
- An Important Archive of Congressionally-Mandated Climate Change Reports Just Went Dark Climate scientists are alarmed by the Trump administration’s latest attack on climate change research. Inside Climate News, Lauren Dalban, Jul 01, 2025.
- Key climate change reports removed from US government websites The national climate assessments help state and local governments prepare for the impacts of a warming world. The Guardian, Associated Press, Jul 01, 2025.
Climate Policy and Politics (4 articles)
- Who`s the Fossil Fuel-Backed "Philosopher" Shaping Trump`s Megabill Clean Energy Cuts? Is a bachelor's degree in philosophy sufficent to become an energy policy expert? Desmog explores this question. DeSmog, Sharon Kelly, Jul 01, 2025.
- Trump administration shuts down U.S. website on climate change The U.S. Global Change Research Program’s website, globalchange.gov, was taken down along with information on how global warming is affecting the country. Los Angeles Times, Ian James, Noah Haggerty, Jul 01, 2025.
- Trump uprooted a major climate effort. Scientists are fighting back. The future of the National Climate Assessment is uncertain, so researchers are looking to write an alternative version that could serve as a substitute. E&E News, Chelsea Harvey, Jul 02, 2025.
- Trump`s climate research cuts are unpopular, even with Republicans Recent polling shows that nearly 80% of registered U.S. voters want government agencies to keep researching and sharing global warming data. The administration is dismantling both. Yale Climate Connections, Karin Kirk, Jul 03, 2025.
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Posted on 3 July 2025 by Doug Bostrom, Marc Kodack
Open access notables
The Emergence of Near-Permanent Marine Heatwave State in the Tropical Indian Ocean During 2023–2024, Soumya, International Journal of Climatology
In 2023/24, global mean surface temperatures exceeded 1.5°C above pre-industrial levels, and the Tropical Indian Ocean (TIO) experienced a record-breaking basin mean anomalous warming of 0.88°C. This unprecedented warming in the TIO is linked to the severe and long-lasting marine heatwave (MHW) events ever recorded in the region, reconciling with the ongoing long-term warming and internal climate variabilities. The MHW events of 2023/24 were primarily centred in the Arabian Sea (AS) and southwestern TIO regions, with mean intensities of 0.73°C and 0.89°C, respectively. The prolonged MHW event developed in the AS region in August 2023 and in the southwestern TIO in July 2023 due to increased oceanic heat gain associated with increased insolation and reduced latent heat loss. The MHW event in the AS was sustained throughout the remainder of the year and the following year by subsurface warming due to the convergence of surface winds in the AS and suppressed cooling by vertical processes. In the southwestern TIO, the event intensified and lasted till December 2024, driven by thermocline warming induced by downwelling Rossby waves, triggered by intensified easterlies associated with an anomalously westward extended cold tongue in the equatorial Indian Ocean, linked to the co-occurrence of strong El Niño and extreme equatorial positive Indian Ocean Dipole (PIOD) events. The extreme warming of the TIO during 2023/24 underscores the ongoing impact of climate change on global ocean surface warming.
Glaciers in Western Canada-Conterminous US and Switzerland Experience Unprecedented Mass Loss Over the Last Four Years (2021–2024), Menounos et al., Geophysical Research Letters
Over the period 2021–2024, glaciers in Western Canada and the conterminous US (WCAN-US), and Switzerland respectively lost mass at rates of 22.2 ± 9.0 and 1.5 ± 0.3 Gt yr−1 representing a twofold increase in mass loss compared to the period 2010–2020. Since 2020, total ice volume was depleted by 12% (WCAN-US) and 13% (Switzerland). Meteorological conditions that favored high rates of mass loss included low winter snow accumulation, early-season heat waves, and prolonged warm, dry conditions. High transient snow lines, and impurity loading due to wildfires (WCAN-US) or Saharan dust (Switzerland) darkened glaciers and thereby increased mass loss via greater absorbed shortwave radiation available for melt. This ice-albedo feedback will lead to continued high rates of thinning unless recently exposed dark ice and firn at high elevations is buried by seasonal snowfall. Physical models that simulate impurity deposition and movement through firn and ice are needed to improve future projections of glacier mass change.
Early warning signs of salt marsh drowning indicated by widespread vulnerability from declining belowground plant biomass, Runion et al., Proceedings of the National Academy of Sciences
Intensifying stressors are weakening resilience in ecosystems across the globe. Here, we show that belowground biomass (BGB), a proxy for salt marsh health, has decreased over a large area of coastal marshes since 2014, indicating growing vulnerability to sea-level rise (SLR)-induced drowning. Using observational modeling, we show a shift in plant biomass allocation, away from belowground resources, which are critical for resilience, toward higher aboveground stocks. Marsh drowning is likely underway, and the window for action may be short lived.
From this week's government/NGO section:
Air and greenhouse gas pollution from private jets, 2023, Daneil Sitompul and Dan Rutherford, International Council on Clean Transportation
While there are several high-fidelity emission inventories for commercial aviation, data on greenhouse gas (GHG) and air pollution from general aviation aircraft, notably private jets activity, remain limited. The authors fill this gap by estimating how much, and where, air and GHG pollution was emitted globally by private jets in 2023. The authors used both a top-down and bottom-up emissions inventory for private jet flights using a variety of data sources, including global flight trajectories, airport coordinates, and engine emission databases.
NDCs as levers for prosperity, health and resilience, Denton et al, Climate Crisis Advisory Group
Current Nationally Determined Contributions (NDCs) are not meeting the urgency or scale of the climate crisis. On the present course, they leave the world heading towards 3°C of warming – well beyond the 1.5°C target set in the Paris Agreement. This report positions NDCs as strategic national tools to drive inclusive growth, resilience, and public well-being. The authors present 10 transformative recommendations to help countries embed climate ambition into national development strategies. These are grouped under four themes: driving prosperity and stability, building healthy and resilient communities, ensuring effective and equitable implementation, and accelerating action and ambition. Collectively, they show how NDCs can become levers for green investment, job creation, and systemic reform – offering a pathway from climate risk to shared, sustainable prosperity. Governments must use the NDC cycle as an opportunity not only to ratchet ambition, but to make climate action a cornerstone of economic and social policy.
130 articles in 56 journals by 891 contributing authors
Physical science of climate change, effects
A Wavier Polar Jet Stream Contributed to the Mid-20th Century Winter Warming Hole in the United States, Chalif et al., AGU Advances Open Access 10.1029/2024av001399
A Weakened AMOC Could Cause Southern Ocean Temperature and Sea-Ice Change on Multidecadal Timescales, Diamond et al., Journal of Geophysical Research: Oceans Open Access 10.1029/2024jc022027
Characteristics and mechanisms of summer long-lived heatwaves in Western North America: Perspective from Rossby wave train, Qiang et al., Atmospheric Research 10.1016/j.atmosres.2025.108208
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Posted on 2 July 2025 by Guest Author
This is a re-post from Yale Climate Connections by Samantha Harrington
Republicans in the U.S. Senate are working to pass their version of the budget reconciliation bill before Congress goes on holiday for July 4. As it stands, the bill would terminate most clean energy tax credits long before their original phase-out date in 2032.
The tax credits, which include money back on electric cars, electric appliances, energy efficiency improvements, and more, have a lot of public support. In a December 2024 survey, researchers at the Yale Program on Climate Change Communication, the publisher of this site, found that 91% of liberal Democrats, 70% of moderate or conservative Democrats, 42% of liberal or moderate Republicans, and 28% of conservative Republicans support tax rebates for electric vehicles. A Yale Climate Connections analysis found that red states stood to benefit the most from the law’s incentives to individuals and businesses.
Some hoped that the Senate would save tax credits that the Republican-controlled House of Representatives proposed cutting in their version of the budget bill that passed in May, but that has not been the case for consumer tax credits for EVs or home improvements. That said, senators have not yet voted on the bill, and because the Senate made substantial changes, the bill will need to return to the House before heading to President Donald Trump’s desk for his signature. So there is still time for constituents to let members of Congress know their thoughts about the proposed legislation.
If the Senate version of the bill does become law as-is, the credits won’t expire immediately. For the most part, consumers will have 180 days to take advantage of the credits before they’re fully terminated.
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Posted on 1 July 2025 by Sue Bin Park
Skeptical Science is partnering with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. You can submit claims you think need checking via the tipline.
Are human CO2 emissions driving current global warming?
While many natural factors influence Earth’s climate, human emissions of heat-trapping carbon dioxide are driving today’s global warming.
Scientists have conducted detailed studies of climate “forcings,” or the factors impacting global temperatures, especially with the past 50 years of satellite data. Long-term natural forcings, such as changes in Earth’s orbit or tectonic movement, take tens of thousands of years. They cannot explain the pace of recent warming.
More immediate, smaller-impact changes occur in shorter-term cycles and cancel out over time. Solar cycles and weather patterns such as El Nino and El Nina manifest as irregular oscillations in temperature graphs.
In contrast, human CO2 emissions have increased by 50% in less than 200 years, from 290 ppm to 430 ppm. Today’s global temperatures are 1.5°C (2.6°F) warmer than the pre-industrial average. The long-term upward trend in today’s temperatures can only be explained by the concurrent human-caused rise in atmospheric CO2.
Go to full rebuttal on Skeptical Science or to the fact brief on Gigafact
This fact brief is responsive to quotes such as this one.
Sources
NASA Carbon Dioxide
NASA Global Temperature
NASA Is current warming natural?
EPA Causes of Climate Change
U.S. Global Change Research Program FOURTH NATIONAL CLIMATE ASSESSMENT
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Posted on 30 June 2025 by Zeke Hausfather
This is a re-post from the Climate Brink
The WMO recently published their WMO Global Annual to Decadal Climate Update that covers the period from 2025 to 2029. This is a regular assessment of near-term dynamic model projections that assess both the forced climate response and short-term natural variability (e.g. ENSO and AMV).
This new update forecasts relatively high global temperatures to likely continue through 2029, with the central estimate form most years similar to what was seen in 2023 and 2024. The figure below shows the 2025-2029 forecast in blue, as well as a “hindcast” of past model performance (green) compared to observations (black).
Despite the central estimate being high, large uncertainties remain; it is hard for these near-term climate projections to firmly rule out temperatures either as low as what was experienced in 2020, or temperatures considerably higher than 2023 and 2024.
If we use the central estimates from the report, however, they would likely imply a crossing date for 1.5C (using the IPCC’s 20-year centered mean approach) that would be earlier than previously expected.
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Posted on 29 June 2025 by BaerbelW, Doug Bostrom
A listing of 28 news and opinion articles we found interesting and shared on social media during the past week: Sun, June 22, 2025 thru Sat, June 28, 2025.
Stories we promoted this week, by category:
Climate Change Impacts (10 articles)
- Heatwave in England to bring temperatures above 32°C (89.6°F) – study finds climate change made this 100 times more likely Science Feedback, Editor: Darrik Burns, June 20, 2025.
- Wildfires: climate change cause and effect Canadians think about a recent object lesson on climate change. Winnipeg Free Press, David McLaughlin, Jun 21, 2025.
- It's hot. Fossil fuels made it hotter. And it'll still be the coldest summer of your life if Trump's "Big, Beautiful Bill" passes this week. HEATED, Emily Atkin, Jun 23, 2025.
- Most tree species face serious climate threat even under modest warming, study reveals Phys.org - latest science and technology news stories, Spanish National Research Council, Jun 24, 2025.
- Global Climate Risk Index Ranks 188 Countries by Vulnerability and Access to Finance State of the Planet, Columbia Climate School, Jun 25, 2025.
- Can Mongolia`s oldest traditions survive a changing climate? Conservation International is helping herders restore the Mongolian steppe. Climate Change, Will McCarry, Jun 25, 2025.
- Unprecedented June heat along the Northeast urban corridor, brought to you by climate change Cities from Philly to Boston break the 100-degree mark, in some cases way ahead of schedule. Yale Climate Connections, Bob Henson, Jun 25, 2025.
- Global Warming Is Speeding Up and the World Is Feeling the Effects New York Times, Sachi Kitajima Mulkey, Claire Brown and Mira Rojanasakul, Jun 26, 2025.
- `It looks more likely with each day we burn fossil fuels`: polar scientist on Antarctic tipping points Despite working on polar science for the British Antarctic Survey for 20 years, Louise Sime finds the magnitude of potential sea-level rise hard to comprehend The Guardian, Jonathan Watts, Jun 27, 2025.
- A Special `Climate` Visa? People in Tuvalu Are Applying Fast. Nearly half the citizens of the tiny Pacific Island nation have already applied in a lottery for Australian visas amid an existential threat from global warming and sea-level rise. NYT > Science, Max Bearak, Jun 28, 2025.
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Posted on 26 June 2025 by Doug Bostrom, Marc Kodack
Open access notables
Increased sea-level contribution from northwestern Greenland for models that reproduce observations, Badgeley et al., Proceedings of the National Academy of Sciences
The Greenland Ice Sheet has been thinning over the past several decades and is expected to contribute significantly to sea-level rise over the coming century. Ice flow models that make these projections, however, tend to underestimate the amount of mass lost from the ice sheet compared to observations, which complicates adaptation and mitigation planning in coastal regions. Here, we constrain a model of northwestern Greenland with a time series of satellite-derived surface velocity data and time-dependent physics to infer unknown ice properties. The model reproduces observed mass loss over the past 13 y within uncertainty. This model—constrained by more data—leads to about 8 to 17% greater sea-level rise contribution from this region by 2100.
Evidence of Emerging Increasing Trends in Observed Subdaily Heavy Precipitation Frequency in the United States, Mascaro et al., Geophysical Research Letters
The magnitude and frequency of heavy precipitation are expected to increase under warming temperatures caused by climate change. These trends have emerged in observational records but with much larger evidence on a daily rather than a subdaily scale. Here, we quantify long-term changes in heavy precipitation frequency in the United States using hourly observations in 1949–2020 from 332 gauges. We demonstrate that, when analyzed collectively, the frequencies of heavy precipitation at multiple durations from hourly to daily exhibit an increase that cannot be explained by natural climate variability. Upward trends are significant at ∼20%–40% of the gauges throughout the country except for the coastal western and southeastern regions, with higher percentages for longer durations. We also show that the frequency of hourly heavy precipitation has mainly grown after ∼2000, thus explaining the limited evidence of trends at the subdaily scale reported in past studies.
Giuseppe Mascaro thanks funding from the U.S. National Science Foundation (NSF) awards #2212702: “CAS-Climate: A Novel Process-Driven Method for Flood Frequency Analysis Based on Mixed Distributions” and #2221803: “Collaborative Research: CAS—Climate: Improving Nonstationary Intensity-Duration-Frequency Analysis of Extreme Precipitation by Advancing Knowledge on the Generating Mechanisms.”
Battery electric vehicles show the lowest carbon footprints among passenger cars across 1.5–3.0 °C energy decarbonisation pathways, Šimaitis et al., Communications Earth & Environment
Passenger car carbon footprints are highly sensitive to future energy systems, a factor often overlooked in life cycle assessment. We use a time-dependent prospective life cycle assessment to enhance carbon footprints under four 1.5–3.0 °C decarbonisation pathways for electricity, fuel, and hydrogen from an energy-based integrated assessment model. Across 5000 comparative cases, battery electric vehicles consistently have the lowest carbon footprints compared to hybrid, plug-in hybrid, and fuel-cell vehicles. For example, battery electric vehicles show an average 32 to 47% lower footprint than hybrid combustion in 3.0 °C and 1.5 °C climate-compatible futures, respectively. This is driven by greater projected decarbonisation of electricity compared to fossil-dominated fuels and hydrogen. Battery electric vehicles meaningfully retain their advantage for mileages over 100,000 km, even in regions with carbon-intensive electricity since these are anticipated to decarbonise the most. Although our study supports battery electric vehicles as the most reliable climate-mitigation option for passenger cars, reducing their high manufacturing footprint remains important.
Can dissent be meaningfully measured in an overwhelming consensus? A citation network case study in climate change research, Grunert, PLOS Clim ate
In scientific discourse, the prevalence of overwhelming consensus obscures the presence of dissenting views as well as their characteristics. This paper explores the potential to meaningfully measure dissent within the context of such a consensus, using climate change research as a case study. Using citation analysis to explore the dynamics of scientific publications and the reception of dissenting opinions, this project questions whether there may be a methodological framework for quantifying dissent. This study employs analysis of citation networks to assess the visibility and impact of minority viewpoints, as well as the viability of such a study. The findings indicate that because dissent in climate change research is miniscule such measurements are limited. Despite that finding, researchers on the fringe of scientific consensus have an outsized impact on social viewpoints. This project has potential to disrupt the ways researchers critically consider the relevance of dissenting research in their own fields, and to think of ways to embrace the impact of research that expands their fields.
In the face of anti-science politics, silence is not without cost, Editors, Nature
We recognize that not all scientific leaders are in a position to be able to speak out, particularly those in countries where doing so could incur a penalty — or even punishment. That is why our call is to international scientific organizations. Academies in countries where the freedom to dissent is protected should also make their concerns known. All need to be aware that silence is also not without cost.
From this week's government/NGO section:
Information Integrity about Climate Science: A Systematic Review, Elbeyi et al., International Panel on the Information Environment
The human response to the climate crisis is being obstructed and delayed by the production and circulation of misleading information about the nature of climate change and the available solutions. The authors found that powerful actors—including corporations, governments, and political parties—intentionally spread inaccurate or misleading narratives about anthropogenic climate change. These narratives circulate across digital, broadcast, and interpersonal communication channels. The result is a decline in public trust, diminished policy coordination, and a feedback loop between scientific denialism and political inaction.
Bright side of the mine. Solar’s opportunity to reclaim coal’s footprint, Cheng Cheng Wu and Ryan Driskell-Tate, Global Energy Monitor
The authors conducted a worldwide survey of surface coal mines closed in the last five years (since 2020) and those forecasted to close over the next five (by the end of 2030). The first-time analysis shows that over 300 surface coal mines recently out of commission could house around 103 GW of photovoltaic (PV) solar capacity, and upcoming closures of large operations could host an additional 185 GW of solar across 127 sites (see Methodology). These abandoned coal mines are predisposed to renewables siting with grid-adjacent and even pre-cleared acreage. If these potential solar projects came to fruition, the world could build almost 300 GW of solar capacity on mined out lands by the end of 2030. Uptake on that scale is equal to 15% of the solar that has already been built globally and would add enough solar capacity to inch the world one step closer to tripling renewables before the end of the decade.
138 articles in 56 journals by 793 contributing authors
Physical science of climate change, effects
Combined emergent constraints on future extreme precipitation changes, Shiogama et al., Nature Communications Open Access 10.1038/s41467-025-60385-1
Observations of climate change, effects
Climate-induced losses of surface water and total water storage in Northeast Asia, Zhang et al., Communications Earth & Environment Open Access 10.1038/s43247-025-02449-0
Evidence of Emerging Increasing Trends in Observed Subdaily Heavy Precipitation Frequency in the United States, Mascaro et al., Geophysical Research Letters Open Access 10.1029/2024gl114292
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Posted on 25 June 2025 by Guest Author
This is a re-post from Yale Climate Connections by Jeff Masters and Bob Henson
In the lead-up to hurricane season, we asked you to donate in support of our coverage of hurricanes, heat waves, wildfires, and other life-threatening extreme weather events. We aimed to raise at least $10,000. And folks, you smashed that goal: Nearly 400 of you stepped up to help, contributing $37,000!
What this means:
- If a hurricane threatens our coasts this summer and fall, you can come here for the coverage you trust.
- We’ll be here to help you understand what’s happening with FEMA, NOAA, and other agencies under the Trump administration.
- We’ll be able to keep more people safe with our alerts to communities in the path of extreme weather — both in English and Spanish.
The support from our audience is beyond our wildest dreams and gives us confidence that our reporting resonates with people in a media landscape increasingly wracked by disinformation. YOU built this, and it’s an honor to create a more activated, climate-aware world alongside our donors.
And this is truly people-powered journalism: The median donation was $50, and 84% of donations were under $100. Our number of sustaining monthly supporters was multiplied by six, which helps us plan our coverage and retain superstar writers. We’re so grateful to everyone who has signed on as a sustaining donor. Will you join them?
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Posted on 24 June 2025 by BaerbelW
A week ago today, we published a blog post highlighting Sabin Rebuttal #33, which answers the question "What is the effect of hot or cold weather on EVs?". With that blog post, this phase of our effort to turn the report "Rebutting 33 False Claims About Solar, Wind, and Electric Vehicles" into individual rebuttals was done and dusted. In this recap we summarize the happenings and provide some behind-the-scenes glimpses into the tasks needed to pull this off. The report was written by Matthew Eisenson, Jacob Elkin, Andy Fitch, Matthew Ard, Kaya Sittinger & Samuel Lavine and published by the Sabin Center for Climate Change Law at Columbia Law School in 2024.
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Posted on 23 June 2025 by Guest Author
This video includes personal musings and conclusions of the creator climate scientist Dr. Adam Levy. It is presented to our readers as an informed perspective. Please see video description for references (if any).
Since President Trump took office in January 2025, he's declared war on climate change research. In this video, I speak with three expert scientists, who explain the devastation caused by Trump's attacks on climate researchers, institutions and reports. These assaults aren't just a huge deal in the USA, where they limit our ability to forecast extreme weather disasters. But they'll also affect our ability to be safe from climate extremes the world over - now and in the future.
Support ClimateAdam on patreon: https://patreon.com/climateadam
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Posted on 22 June 2025 by BaerbelW, Doug Bostrom
A listing of 29 news and opinion articles we found interesting and shared on social media during the past week: Sun, June 15, 2025 thru Sat, June 21, 2025.
Stories we promoted this week, by category:
Climate Science and Research (6 articles)
- Climate Crisis 'Evil Twin' Is Coming for Marine Life Scientists have warned that the planet crossed the global boundary for ocean acidification around the year 2020, according to a new study. Newsweek, Thomas Westerholm, Jun 16, 2025.
- Human influence on climate detectable in the late 19th century A new paper describes how humans were influencing Earth's climate by cooling the stratosphere in the late 19th century. Proceedings of the National Academies of Sciences, Ben Santer et al. , June 16, 2025.
- Study finds planetary waves linked to wild summer weather have tripled since 1950 Phys.org, Seth Borenstein (AP), Jun 17, 2025.
- Why imperfect climate models are more helpful than you think Even flawed models are helping scientists unlock new truths about our changing planet. Yale Climate Connections, Ryan O’Loughlin, Jun 17, 2025.
- Guest post: Why 2024`s global temperatures were unprecedented, but not surprising Human-caused greenhouse gas (GHG) emissions in 2024 continued to drive global warming to record levels. Carbon Brief, Piers Forster and Debbie Rosen, Jun 18, 2025.
- Skeptical Science New Research for Week #25 2025 Our latest listing of research on anthropogenic climate change, how it's changing our lives now, and how we'll deal with the problem we've created. Skeptical Science, Doug Bostrom & Marc Kodack, Jun 19, 2025.
Climate Policy and Politics (6 articles)
- What the Nation Stands to Lose Without climate.gov Council on Strategic Risks, Center for Climate and Security, June 11, 2025.
- How Trump`s assault on science is blinding America to climate change E&E News, Politico, Scott Waldman, Jun 16, 2025.
- The World`s Banks are Still Betting on Fossil Fuel Industry Growth The biggest funders of fossil fuel expansion are U.S. banks that, like those in other countries, are retreating on their climate commitments. Inside Climate News, Georgina Gustin, Jun 17, 2025.
- Voters Are Concerned About Rising Costs and Think Climate Change Will Financially Affect Them This report illustrates a growing split between US voters and leadership of the federal government on how matters of energy and climate are being handled. Data For Progress, Brynne Robbins and Elias Kemp, June 17, 2025.
- Trump cuts to NOAA, NASA 'blinding' farmers to risks, scientists warn TheHill.com, Saul Elbein, Jun 18, 2025.
- NOAA`s climate information portal to go silent The Trump adminstration continues to efficiently generate synthetic ignorance. E&E, Politico, Daniel Cusick, Jun 18, 2025.
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Posted on 21 June 2025 by Sue Bin Park
Skeptical Science is partnering with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. You can submit claims you think need checking via the tipline.
Is modern warming just a rebound from the Little Ice Age?
Global temperatures are warmer today than immediately before the Little Ice Age.
The Little Ice Age was a regional cooling phenomenon caused by internal forcings that mostly moved heat around within Earth’s climate system.
This event affected North America and Europe from 1350 to 1850. While external forcings like volcanic eruptions and decreased solar activity occurred, it was a massive export of Arctic sea ice into the North Atlantic by warm currents that disrupted ocean circulation and triggered prolonged regional cooling.
The end of the Little Ice Age coincided with rising solar output and industrial greenhouse gas emissions. However, since the 1950s, solar activity has declined while global temperatures have increased.
Today’s warming is driven by human emissions, increasing the amount of heat in the system rather than redistributing it.
The late 20th century is the warmest interval in the last 2,000 years for over 98% of the globe.
Go to full rebuttal on Skeptical Science or to the fact brief on Gigafact
This fact brief is responsive to quotes such as this one.
Sources
University of Massachusetts Winter Is Coming: Researchers Uncover the Surprising Cause of the Little Ice Age
Eos The Little Ice Age Wasn’t Global, but Current Climate Change Is
Journal of Geophysical Research Global warming in the context of the Little Ice Age
Salon What climate change deniers get totally wrong about the Little Ice Age
Science Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly
Nature No evidence for globally coherent warm and cold periods over the preindustrial Common Era
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