Climate Chat
Climate Chat is a podcast that explores climate change topics with scientists, technologists, authors, advocates, and communicators. Hosted by Dan Miller and Leon Simons, the show aims to help listeners understand and combat climate change through in-depth discussions.
Episodes
Methane Eradication: Matthew Johnson's Radical Chemistry
In this Climate Chat episode, host Dan Miller interviews atmospheric scientist Dr. Matthew S. Johnson on his critical work to find ways to eradicate methane from point sources such as a cow barn, as well as from the atmosphere.
Matthew S. Johnson, PhD is a Professor of Chemistry at the University of Copenhagen. He has a Bachelor in Chemistry from Macalester College in St. Paul Minnesota and a PhD
I Met These Climate Start-ups—Here’s What They’re Building
In this Climate Chat episode, host Dan Miller reviews a number of climate tech start-up companies that he met at the recent Venture Summit West conference in Mountain View, California.
Links to the start-up companies mentioned in the episode:
Green Gravity: https://greengravity.com
RISE Robotics: https://riserobotics.com
Element Zero: https://elementzero.green/
ADAR Plus: https://www.adarte
Students Fighting To Force Polluters to Pay: Carbon Fee & Dividend w/ Katharine Gage
In this Climate Chat episode, host Dan Miller Katharine Gage, a climate activist working to get students to rally around the Carbon Fee and Dividend (CFD) carbon pricing policy.
Katharine Gage graduated from Bowdoin College with a major in Earth and Oceanographic Science and a minor in Psychology. Her academic work included research in oceanography and biogeochemistry. She has been leading climat
Ask Us Anything #3 with Climate Chat Hosts Dan Miller & Leon Simons
In this Climate Chat episode, hosts Dan Miller and Leon Simons discuss the latest climate news and any audience questions. You can post questions in the live YouTube or LinkedIn chat or post them in the program announcement threads on Twitter/X or Bluesky.
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Listen to Climate Chat on Apple Podcasts:
https://podcasts.apple.com/us/podcast/climate-chat/id1893162516
Liste
Can Technology Fix the Climate? with Adam Dorr
In this Climate Chat episode, host Dan Miller interviews author and RethinkX's Director of Research, Adam Dorr, about his two books, Brighter, and The Degrowth Delusion. RethinkX is a think tank that focuses on disruptive technologies including renewable energy and precision fermentation. Adam argues renewable energy will dominate future energy supply and that "degrowth" will not provide us with
Throwing Shade at Global Warming: Risks & Reality of Planetary Sunshades with Ross Centers
In this Climate Chat episode, host Dan Miller interviews Planetary Sunshade Institute's Board Member and former Executive Director, Ross Centers, on the science, risks, and reality of using giant space-based sunshades located between the Sun and the Earth to reduce global warming.
Ross Centers is an American planetary geologist, space entrepreneur, and climate advocate. He is the Co-Founder and
The White House Scientist Scaling Climate Solutions feat. Phil Duffy
In this Climate Chat episode, host Dan Miller interviews Phil Duffy, Chief Scientist for Spark Climate Solutions and former Climate Science Advisor for President Biden. We will discuss Phil's White House experience as well as his current role at Spark Climate Solutions addressing unsolved climate challenges.
Dr. Phil Duffy is a scientist who is dedicated to understanding and managing the human co
New Global Emissions Projections: Scrapping the Highs & Lows with Detlef van Vuuren
In this Climate Chat episode, hosts Leon Simons and Dan Miller interview climate scientist Detlef van Vuuren about his recent paper where he lays our new "emissions scenarios" that will be used by the IPCC to predict future global warming. Since future temperatures depend on our future greenhouse gas emissions, scientists need to use emission scenarios to predict future temperatures. Past scenario
Biochar Carbon Removal: Finally Ready for Primetime? with Alan Ransil
In this Climate Chat episode, host Dan Miller interview Devonian Systems co-founder and CEO Alan Ransil about their approach to producing biochar. Biochar is produced when biomass is burned without the presence of oxygen, a process know as pyrolysis. Wood treated this way is also known as charcoal. Biochar is a very stable form of carbon and, therefore, it is a way to sequester CO2 from the atm
Climate Blind Spots: Why SF Climate Week Worried Me
In this Climate Chat episode, host Dan Miller talks about what he learned at San Francisco Climate Week and what worried him about optimism bias and the lack of appreciation of accelerated warming and tipping points. He will also discuss some optimistic signs of awareness and solutions.
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Listen to Climate Chat on Apple Podcasts:
https://podcasts.apple.com/us/podcast/cl
Current Events: Are We Hitting the AMOC Tipping Point? with AMOC Scientist René van Westen
In this Climate Chat episode, we interview returning guest René van Westen on his latest Atlantic Meridional Overturning Circulation (AMOC) research, including his research that shows the recent sudden shift of the Gulf Stream is an indication of pending AMOC collapse. Dr. Westen is a postdoctoral researcher at Utrecht University in the Netherlands. René is the author of a number of recent scien
Can We Reflect the Sun & Cool the Earth? with SRM Scientist Doug MacMartin
In this Climate Chat episode, Cornell climate scientist -- and returning guest -- Douglas MacMartin discusses the latest research in Sunlight Reflection Methods (a.k.a, solar radiation management (SRM) and Solar Geoengineering) and the practicality of implementing SRM in the coming decade, if needed. Douglas MacMartin is an Associate Professor in the Sibley School of Mechanical and Aerospace Engin
The Iran War Climate Paradox Explained
In this Climate Chat episode, Host Dan Miller discusses the Iran war's positive and negative climate impacts, and explains why lower fossil fuel emissions caused by high oil prices due to the Iran war will not lower atmospheric CO2 levels nor reduce global warming.
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years
3 Million Year Climate Secrets: What the Past Teaches Us
In this Climate Chat episode, Hosts Dan Miller and Leon Simons discuss recent research that measured the past 3 million years of greenhouse gases, and ocean heat content, and discuss what it means to our climate future.
Link to research papers:
"Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years":
https://www.nature.com/articles/s41586-025-10032-y
"Global ocean heat con
Seaforestation Can Reverse Climate Change with Brian von Herzen
In this Climate Chat episode, we interview Climate Foundation's Founder and Executive Director Brian von Herzen about the Climate Foundation's research of "seaforestation," which is a process that accelerates the growth of ocean kelp that results in (1) reducing greenhouse gas emissions, (2) sequesters atmospheric CO2, (3) increases reflective cloud coverage which results in lower global temperatu
Business Ethics & Climate Change with Alison Taylor
In this Climate Chat episode, we interview the NYU professor and author Alison Taylor on business ethics and its impact on climate change (and vice versa).
Alison Taylor joined New York University Stern School of business as a clinical associate professor in January 2023. Her research focuses on the organizational dimension of corporate responsibility and business ethics. She has expertise in st
"Work on Climate" & Regenerative Economics with Eugene Kirpichov
In this Climate Chat episode, we interview the CEO of Work on Climate, Eugene Kirpichov, about the Work on Climate resource and its new focus on regenerative economics.
Eugene Kirpichov is Co-founder and Executive Director of Work on Climate, a global community helping professionals take action on climate across industries and disciplines. Created to help people transition into climate-related ca
Why We “Choose to Fail” on Climate Action
In this Climate Chat episode, host Dan Miller discusses the reasons that humanity is failing to seriously address the existential climate crisis. While climate science clearly indicates that we must act urgently and dramatically, and cost-effective climate and energy solutions are available, we continue to "choose to fail."
Related Climate Chat programs:
Barriers to Climate Action: https://y
SRM Research: Science, Risk & Responsibility with Dakota Gruener
In this Climate Chat episode, host Dan Miller interviews the CEO of Reflective, Dakota Gruener, about her organization's support of Sunlight Reflection Methods (SRM, a.k.a., solar-geoengineering) research.
Dakota Gruener leads Reflective, a non-profit climate initiative accelerating the pace of sunlight reflection research. Across a career spanning global health, digital privacy, and climate, Dak
+2C by 2030s?!
In this Climate Chat episode, hosts Dan Miller and Leon Simons discuss the latest information on global temperature trends and predictions of reaching +2ºC in the 2030s. We will also discuss James Hansen's latest communications.
James Hansen's latest communication: "Another El Nino Already? What Can We Learn from It?"
https://mailchi.mp/caa/another-el-nino-already-what-can-we-learn-from-it?e=a29
Risks of Termination Shock with Francisco Estrada
In this Climate Chat episode, we interview climate scientist Francisco Estrada about his recent paper assessing the risks of "Termination Shock" following the implementation of Solar Radiation Management (SRM, a.k.a., solar-geoengineering). Termination Shock is a rapid, severe warming spike that would occur if SRM were suddenly stopped, because accumulated greenhouse gases would heat the planet a
Can SRM Prevent Tipping Points?
In this Climate Chat episode, host Dan Miller discusses SRM and its possible impact on various tipping points. Much of the information comes from the the following research paper:
"The interaction of solar radiation modification with Earth system tipping elements"
by Gideon Futerman, Mira Adhikari, Alistair Duffey, Yuanchao Fan, Jessica Gurevitch, Peter Irvine and Claudia Wieners:
https://esd.cop
Science vs. Economics on Climate Change
In this Climate Chat episode, host Dan Miller discusses how economic assessments of the risks of climate change differ greatly from scientific assessments.
Related reports:
Loading the DICE Against Pensions:
https://carbontracker.org/reports/loading-the-dice-against-pensions/
Parasol Lost: Recovery plan needed - Global risk management for human prosperity:
https://greenfuturessolutions.com/wp-c
Optimism Bias & Climate Change
In this Climate Chat episode, host Dan Miller discusses optimism bias as it relates to climate change.
Related reports and studies:
Emphasizing urgency of climate change is insufficient to increase policy support:
https://www.sciencedirect.com/science/article/pii/S2590332221001160
Cognitive Biases in Climate Risk Management
https://www.braced.org/contentAsset/raw-data/533c48ab-749c-49e9-971b-3d
Generations of Global Warming: A Dutch Perspective
In this Climate Chat episode, host Leon Simons discusses the impacts of global warming over generations of his Dutch family.
Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams
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Leon Simons is a climate scientist based in the Netherlands. He was a co-author with James Hansen on the 2023 "Global Warming in the Pipeline" paper that dis
2026 Climate Change Outlook
In this Climate Chat episode, hosts Leon Simons and Dan Miller discuss the state of climate change in 2026.
Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The Roda Group, a climate-tech venture capital
Climate Chat Year In Review 2025
In this Climate Chat episode, Host Dan Miller reviews the major climate stories of the year and gives a quick recap of the 2025 Climate Chat programs.
Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The
Why SRM/Solar-Geoengineering is Required (with Q&A)
In this Climate Chat Shorts episode, host Dan Miller presents why Solar Geo-engineering (a.k.a., Solar Radiation Management or SRM) is now required to avoid more than 2ºC of warming and catastrophe.
To listen to the presentation along with follow-on Q&A (about 1 hour total), see this video: https://youtube.com/live/icb_op9_41I
For more in-depth programs on SRM/Solar-Geoengineering, see the Cl
Ask Us Anything #2 with Dan Miller & Leon Simons
In this Climate Chat episode, we answer listener questions posted on the YouTube Live chat, X/Twitter, and BlueSky. You can also forward questions ahead of the program to ClimateChatClub (at) gmail (dot) com.
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The Roda Group, a climate-tech ve
California & Clean Energy with CEC Chair David Hochschild
In this Climate Chat episode, we interview the Chair of the California Energy Commission (CEC), David Hochschild, about the CEC's goal of moving California to 100% clean energy.
David Hochschild was appointed chair of the California Energy Commission by Governor Gavin Newsom in February 2019. He fills the environmental position on the five-member Commission where four of the five members are requ
COP30 & "The Plan" For Climate Action
In this Climate Chat episode, Climate Chat host Dan Miller discusses the UN COP30 (Conference of the Parties) in Belém, Brazil that recently concluded, and the current state of global plan for climate action.
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The Roda Group, a climate-tech ven
3 Climate Truths Everyone Must Know
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss climate facts that everyone should (but don't) know regarding the amount of warming we can expect, the availability of solutions, and the opportunity to avoid the worst outcomes (that we are currently headed for).
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Dan Miller has been giving talks around the world on the need for urgent
'Doomsday Glacier' Update with Eric Rignot
In this Climate Chat episode, we interview glaciologist and climate scientist Eric Rignot about the Thwaites glacier in Antarctica (a.k.a., the Doomsday Glacier), the broader West Antarctic Ice Shelf (WAIS), Greenland, and their impact on sea level rise.
Professor Rignot is a world-renowned glaciologist who studies the effects of global climate change on polar ice sheets. He uses satellites, airb
What Politics Can & Can't Do for Climate with Jigar Shah
In this Climate Chat episode, we interview Jigar Shah about his experience running the Department of Energy's Loan Program Office during the Biden administration.
Jigar Shah is a solar pioneer and clean energy entrepreneur with over 25 years of experience. He's known for founding SunEdison in 2003, which pioneered “no money down” solar and became the world's largest solar services company. He co-
Climate Politics When It's Too Late with Wim Carton
In this Climate Chat episode, we interview author and professor Wim Carton about his new book, co-authored with Andreas Malm, titled: "The Long Heat: Climate Politics When It's Too Late." The book focuses on climate adaption, negative emissions, and solar geoengineering and critiques them for being used as excuses to avoid rapid emissions reduction.
Wim Carton is Associate Professor of Sustainab
Climate Politics When It's Too Late with Wim Carton
In this Climate Chat episode, we interview author and professor Wim Carton about his new book, co-authored with Andreas Malm, titled: "The Long Heat: Climate Politics When It's Too Late." The book focuses on climate adaption, negative emissions, and solar geoengineering and critiques them for being used as excuses to avoid rapid emissions reduction.
Wim Carton is Associate Professor of Sustainab
Debunking the DoE Climate Denial Report with Andrew Dessler
In this Climate Chat episode, we interview climate scientist Andrew Dessler on his recent paper that debunks the "climate denial" report that was issued by the U.S. Department of Energy.
Andrew Dessler is a climate scientist who studies both the science and politics of climate change. He is a Professor of Atmospheric Sciences and director of Texas A&M’s Texas Center for Climate Studies.
His sci
Global Warming Acceleration, presentation by Leon Simons at the Global Heating Emergency Conference
In preparation for COP30, Leon gave this keynote presentation at the global online conference, "The Global Heating Emergency, Preventing 2°C by 2040: What’s the Plan?", which took place October 15-16.
In this presentation Leon talks about the increased rate of global heating and how accelerated warming will lead to rapidly crossing risk levels that the world agreed to avoid in Paris 10 years ag
Northern/Southern Hemisphere Warming Asymmetry
In this Climate Chat episode, hosts Dan Miller and Leon Simons recent research on the asymmetry between warming in the Northern Hemisphere and South Hemisphere.
PNAS paper: Emerging hemispheric asymmetry of Earth’s radiation:
https://www.pnas.org/doi/10.1073/pnas.2511595122
And in Science: Observed trend in Earth energy imbalance may provide a constraint for low climate sensitivity models:
https
Is "Carbon Farming" a Scam? with author Michael Grunwald
In this Climate Chat episode, We interview author Michael Grunwald about his new book, "We Are Eating the Earth":
Humanity has cleared a land mass the size of Asia plus Europe to grow food, and our food system generates a third of our carbon emissions. By 2050, we’re going to need a lot more calories to fill nearly 10 billion bellies, but we can’t feed the world without frying it if we keep teari
+3ºC by 2050?!
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss recent report from the German Meteorological Society and Physical Society that says that a warming of +3ºC (+5.4ºF) is possible by 2050. This is significantly more the IPCC and many other climate scientists say. As we will discuss, when it comes to existential threats, we must assume the worse and hope for the b
'A Responsible Way to Cool the Planet'?!
Dan Miller and Leon Simons talk about New York Times Opinion article on Sunlight Reflection Methods (SRM) by Zeke Hausfath and David Keith.
Humanity will be forced to make a balanced assessment of the risks of (intentionally) cooling vs not cooling the planet.
More than what we do now.
See yesterday's Climate Chat, where we talk about the aerosol termination shock of the sulphur air pollution t
What the Hell is Going On in the North Pacific?
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss recent temperature readings from the North Pacific Ocean and other areas.
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The Roda Group, a climate-tech venture capital group, and he serves as an advisor for
Carbon Capture for Pulp & Paper Mills with Brett Henkel
In this Climate Chat episode, we interview Svante co-founder and SVP, Brett Henkel, on Svante's carbon capture system and how it can it can produce negative carbon emissions when used to capture CO2 from pulp and paper mills. We will also discuss other applications for carbon capture including cement and steel plants, as well as direct air capture (DAC).
As co-founder of Svante, Brett was instru
What SETI Tells Us About Climate Change on Earth with Bill Diamond
In this Climate Chat episode, we interview SETI (Search for Extraterrestrial Intelligence) Institute President & CEO Bill Diamond about what the search for extraterrestrial intelligence tells us about human-caused climate change on our home planet.
Bill Diamond is a Silicon Valley technology veteran and current President and CEO of the SETI Institute in Mountain View, California. The SETI Institu
Bill McKibben on The Power of Solar Power
In this Climate Chat episode, we interview author and activist Bill McKibben about his new book, "Here Comes the Sun."
Bill McKibben is the founder of Third Act, which organizes people over the age of 60 for action on climate and justice, and of 350.org, the first global grassroots climate campaign. He’s written more than a dozen books, including The End of Nature, Deep Economy, and Falter, and h
Hansen: Venus Syndrome & Runaway Climate
In this Climate Chat episode, hosts Dan Miller and Leon Simons discuss climate scientist James Hansen's recent communications about the "Venus Syndrome" and runaway climate.
Link to Hansen's recent communications: "Sophie's Planet: Chapter 10. The Venus Syndrome & Runaway Climate":
https://www.columbia.edu/~jeh1/mailings/2025/VenusSyndrome.2025.08.27.pdf
Link to our recent interview with James H
Debunking a Climate Denier: A Masterclass of Disinformation
In this Climate Chat episode, host Dan Miller goes step-by-step through a comment left on the Climate Chat interview with James Hansen that lays out 30 so-called "facts" about climate change that are, in reality, wrong, misleading, or irrelevant (or a combination of those three). The purpose of the exercise is to expose climate denier myths and discuss how climate disinformation is used to slow pr
What Everyone Must Know About Climate Sensitivity with James Hansen
In this Climate Chat episode, renowned climate scientist James Hansen returns to Climate Chat to discuss Climate Sensitivity. Climate sensitivity relates to how much the Earth will warm in response "forcings" such as human-caused greenhouse gas (GHG) emissions. Such warming includes the direct warming in response to the forcing plus warming due to feedbacks to the direct warming. The total short
Climate Quotes & Memes
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss climate change related quotes and memes. Leave your favorite climate quotes and memes in the comments.
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is co-founder of The Roda Group, a climate-tech venture capital group, a
Ask Me Anything with Climate Chat Host Dan Miller
In this Climate Chat episode, Climate Chat host Dan Miller answers climate-related questions posted on YouTube, Twitter/X, and Bluesky.
If you would like to view an interview and missed Thursday's discussion with former US Energy Secretary Steven Chu, follow this link:
https://youtube.com/live/16hxH2dTB7o
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Dan Miller has been giving talks around the world on the need f
Climate Change & Politics with Steven Chu
In this Climate Chat episode, we interview former U.S. Secretary of Energy and Nobel Laureate Steven Chu about the state and future of climate change, why political leaders have not addressed climate change seriously, and what can be done to increase action.
Steven Chu is the William R. Kenan, Jr. Professor of Physics, of Molecular and Cellular Physiology, and of Energy Science and Engineering at
Acceleration of Global Warming and Climate Tipping Points with Peter Cox
In this Climate Chat episode, Leon Simons interviews University of Exeter climate scientist Peter Cox about the acceleration of global warming, climate tipping points, and other climate-related subjects.
Professor Peter Cox is Professor of Climate System Dynamics in Mathematics and the Director of the Global Systems Institute at the University of Exeter. He has previously worked at the Met Office
Human Fingerprint on Climate with Ben Santer
In this Climate Chat episode, we interview climate scientist Ben Santer about his lifelong work studying the human fingerprint on climate change.
Ben Santer was a climate researcher at Lawrence Livermore National Laboratory and former researcher at the University of East Anglia's Climatic Research Unit. He retired from the Lawrence Livermore National Laboratory in 2021 and is now a Distinguishe
Cause of Extreme North Atlantic Warming in 2023 with Matthew England
In this Climate Chat episode, we interview University of New South Wales climate scientist Matthew England on his recent Nature paper "Drivers of the extreme North Atlantic marine heatwave during 2023." We will also discuss Matthew's research on the Atlantic Meridional Overturning Circulation (AMOC) and changes in the Southern Ocean circulation and its impact on Antarctica.
Matthew England is Aus
Climate Adaptation Investment with Sanjay Wagle
In this Climate Chat episode, we interview The Lightsmith Group co-founder and Managing Director Sanjay Wagle about his firm's focus on investing in climate adaptation and resilience opportunities.
Sanjay Wagle is co-founder and Managing Director of The Lightsmith Group, a private equity firm investing in growth-stage technology companies that address critical societal needs, with a current focus
Unintended Consequences of Reducing Fossil Fuel Emissions
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss the unintended consequences of reducing fossil fuel emissions and the problems of pursuing a "emissions reduction only" approach to addressing climate change.
Leon Simons' 2023 LinkedIn post: "Unintended consequences of cleaning up our mess":
https://www.linkedin.com/pulse/unintended-consequences-cleaning-up-our-m
Climate Threatens Food Supplies Even With Adaption, with Andrew Hultgren
In this Climate Chat episode, We interview Andrew Hultgren about his recent paper in the journal Nature, "Impacts of climate change on global agriculture accounting for adaptation." The paper concludes that there will be significant drops in agriculture productivity under global warming even with adaption measures. Surprisingly, negative impacts are larger in developed countries with advanced agr
Translating Climate to Human, with Ben Carey
In this Climate Chat episode, We interview Ben Carey, the co-founder of the Utopia Bureau, a climate communications lab, prototyping innovative ways to trigger climate action urgently and at scale. Its approach is to help tip social norms across multiple fronts.
Its founders are Ben Carey and Henrik Delehag, authors and ex-advertising creative directors. They draw on a wide network of strategic,
Mati Carbon: Winner of $50M Carbon Removal Xprize, with CEO Shantanu Agarwal
In this Climate Chat episode, We interview Shantanu Agarwal, the CEO of Mati Carbon which was the Grand Prize winner of the Carbon Removal XPrize. Mati spreads crushed basalt rocks on farmer fields in the global south which improves soil quality and the crushed rock absorbs CO2 which earns carbon removal credits.
Shanatanu Agarwal is an experienced climate tech serial entrepreneur with more than
Global Climate Change Indicators Update & What's Missing?
In this Climate Chat episode, Climate Chat hosts Dan Miller and Leon Simons discuss the upcoming report: "Indicators of Global Climate Change 2024: annual update of key indicators of the state of the climate system and human influence" which is in pre-print for the journal Earth System Science Data (ESSD). We will also discuss climate change indicators that are not included in the report.
Link to
Public Perception of Climate Change & Climate Solutions with Kaitlin Raimi
In this Climate Chat episode, we interview University of Michigan Professor Kaitlin Raimi about her research on public perception of climate change and climate solutions such as carbon capture and sunlight reflection methods (SRM).
Kaitlin Raimi is an associate professor of public policy at the University of Michigan Ford School. As a social/environmental psychologist, her interests center on how
Ask Us Anything with Dan Miller & Leon Simons
In this Climate Chat episode, we answer viewer questions. Please post your questions ahead of the live program on X/Twitter or Bluesky. During the livestream, you can post questions via the YouTube comments (please preface your question with "Question:").
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Dan Miller has been giving talks around the world on the need for urgent climate action for over 20 years. He is
AMOC Collapse Research Update with René van Westen
In this Climate Chat episode, we interview returning guest René van Westen on his latest Atlantic Meridional Overturning Circulation (AMOC) research. Dr. Westen is a postdoctoral researcher at Utrecht University in the Netherlands. René is the author of a number of recent scientific papers on AMOC including the following:
Substantial Risk of 21st Century AMOC Tipping even under Moderate Climate
When Will We Go Over 2ºC? & Hansen's Cloud Update
In this Climate Chat episode, hosts Dan Miller & Leon Simons discuss warming trends and what they say about when the Earth will cross the 2ºC warming threshold. We will also discuss the latest communications from climate scientist James Hansen on cloud feedbacks and what that means for near-term global warming.
Link to James Hansen's communication: "Large Cloud Feedback Confirms High Climate Sens
Why Climate Policies Fail
In this Climate Chat episode, Dan Miller presents the second half of a lecture he gave recently at the Middlebury Institute of International Studies in Monterey. This talk is on why climate policies fail and highlights the mistakes made when developing climate policies and ends with a set of policies that would seriously address the climate crisis.
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Link to first half o
European Geosciences Union 2025: "Disneyland for Earth Scientists," with Leon Simons
In this Climate Chat episode, Leon Simons reports on the European Geosciences Union (EGU) 2025 General Assembly meeting that ended Friday.
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Link to EGU 2025 website: https://www.egu25.eu
Leon Simons is a climate scientist based in the Netherlands. He was a co-author with James Hansen on the 2023 "Global Warming in the Pipeline" paper that discussed the recent accelera
Sunlight Reflection Methods Can Stop AMOC Collapse with Douglas MacMartin
In this Climate Chat episode, Cornell climate scientist -- and returning guest -- Douglas MacMartin discusses a research paper he co-authored that says Sunlight Reflection Methods (a.k.a, solar radiation management - SRM) can stop the weakening of the Atlantic Meridional Overturning Circulation (AMOC), which is the ocean "conveyor belt" that transports warm water from the tropics to northern Europ
Climate Science Update with Dan Miller (Abridged)
In this Climate Chat episode, Dan Miller presents an update on the latest climate science, with an emphasis on the recent research from climate scientist James Hansen as well as NASA scientist George Tselioudis. This presentation is based on a lecture that Dan gave recently at the Middlebury Institute of International Studies at Monterey.
Note: This abridged version does not include Q&A at the e
Can We Save Ourselves? with Dana Fisher
In this Climate Chat episode, we talk with Dana Fisher, author of "Saving Ourselves: From Climate Shocks to Climate Action," about what it will take to get the public to demand climate action and get policymakers to listen to them.
Dana R. Fisher is the Director of the Center for Environment, Community, & Equity and Professor in the School of International Service at American University. She curr
CO2 Accounting Scam? with Dan Miller & Leon Simons
In this Climate Chat episode, Leon Simons and Dan Miller will discuss how the IPCC treats CO2 and aerosol emissions differently and how that leads to an underestimation of climate impacts.
Link to posts on this subject:
https://bsky.app/profile/leonsimons.bsky.social/post/3lljyjnclts2a
https://x.com/ryankatzrosene/status/1905326300363194478
Many other Climate Chat programs on accelerated warming
Direct Action: Will It Disrupt Climate Inaction? with Michael Greenberg
In this Climate Chat episode, we interview Climate Defiance founder and executive director Michael Greenberg on the organization's goals, tactics, and successes, and how their strategy may change given the current administration's attacks on climate action and science.
Michael Greenberg is the founder and executive director of Climate Defiance. His work focuses on resisting new fossil fuel infras
Reducing Air Pollution Increases Methane?! with Vincent Gauci
In this Climate Chat episode, we interview Dr. Vincent Gauci on how reducing air pollution results in increased atmospheric methane concentrations.
Vincent Gauci is professor of Geography and Environmental Sciences and a Birmingham Professorial Fellow at the University of Birmingham in the UK. Professor Gauci investigates how the biosphere interacts with the atmosphere and he explores questions
The Impact of Climate Change on Water with Peter Gleick
In this Climate Chat episode, we interview Dr. Peter Gleick on the impact that climate change is having, and will have, on water, including water availability, floods, droughts, extreme rainfall, water-driven conflict, and "peak water."
Dr. Peter Gleick is a leading scientist, innovator, and communicator on water and climate issues. He co-founded the Pacific Institute in Oakland,California in 198
Overshoot & Climate Change with William Rees
In this Climate Chat episode, we discuss the issue of ecological footprint overshoot and climate change with Professor William E. Rees.
William Rees is a bio-ecologist, ecological economist, former Director and Professor Emeritus of the University of British Columbia’s School of Community and Regional Planning. His early research focused on environmental assessment but gradually extended to the b
Driving Public Demand for Climate Action with David Fenton
In this Climate Chat episode, I will interview returning guest David Fenton, a Climate Communications Expert & Activist, about the failure of the climate community to engage the public and how we can get the public to demand action on climate change.
David founded the largest Public Relations firm focused on social causes, Fenton Communications. After retiring from the firm, David is dedicating h
Hansen Temp Update & Climate Chat Special Announcement
In this Climate Chat episode, Leon Simons and I will discuss the new communication by James Hansen titled "The Acid Test: Global Temperature in 2025" In his message, Hansen discusses what current temperatures say about his theory on why the global temperature has accelerated in recent years. Leon and I will also make an announcement about upcoming enhancements to the Climate Chat channel.
Link
Citizens' Climate Lobby: What Now? with Dana Nuccitelli
In this Climate Chat episode, we speak with Citizens' Climate Lobby's (CCL) Research Coordinator, Dana Nuccitelli, about what CCL does and how it is going to navigate the political environment that is moving away from climate action and science in general.
Citizens’ Climate Lobby is a nonprofit, nonpartisan, grassroots advocacy climate change organization focused on national policies to address t
New Hansen Paper: "Global Warming Has Accelerated" with Leon Simons
In this Climate Chat episode, Leon Simons and I will discuss the new paper by James Hansen, et al, titled "Global Warming Has Accelerated: Are the United Nations and the Public Well-Informed?" In the paper, Hansen discusses how the recent IMO regulations on ship emissions were a significant contributor to the recent acceleration in global warming. The paper more broadly shows that aerosols are a
Future of Climate Denial with Tad DeLay
In this Climate Chat episode, we will discuss climate denial (and denial in general) with Tad DeLay, author of "Future of Denial: The Ideologies of Climate Change." Tad will discuss how it is not just conservatives that are in denial of climate change.
Tad DeLay is a philosopher, religion scholar, and interdisciplinary critical theorist. He teaches in Baltimore. He is the author of four books.
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