Climate Chat

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 content over the past 3 million years":

https://www.nature.com/articles/s41586-026-10116-3

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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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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 temperatures.

Brian Von Herzen, Ph.D., is the founder and executive director of the Climate Foundation, which upholds the vision and the mission to regenerate life in the ocean using Marine Permaculture technology. As Executive Director, Brian leads Climate Foundation’s large-scale seaweed mariculture programs to develop sustainable food, feed and fertilizer value chains, provide ecosystem life support, and sustain blue carbon sinks.

Brian graduated magna cum laude in three years from Princeton University with a degree in Physics. He holds a Ph.D. in planetary science from California Institute of Technology where he was awarded the prestigious Hertz Fellowship, and has been awarded numerous patents. After two decades developing system solutions for companies such as Intel, Disney, Pixar, Microsoft, HP, and Dolby, Brian launched the Climate Foundation in order to investigate groundbreaking nature-based solutions to the climate and other environmental challenges.

Brian leads an international team of scientists, engineers, technicians, social scientists and seaweed farmers. Currently and most importantly, Brian is leading a successful Marine Permaculture seaforestation demonstration project in the Philippines.

Climate Foundation website: https://www.climatefoundation.org

Follow Climate Foundation on X/Twitter: @ClimateFdn

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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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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 strategy, sustainability, political and social risk, culture and behavior, human rights, ethics and compliance, stakeholder engagement, anti corruption and professional responsibility. Alison's first book, Higher Ground, was published by Harvard Business Review Press in February 2024. Her previous work experience includes being a Managing Director at non-profit business network Business for Social Responsibility and a Senior Managing Director at Control Risks. She holds several advisory roles, including with sustainability non-profit Business for Social Responsibility, VentureESG, Pictet Group and KKR. Alison is also a member of the World Economic Forum Global Future Council on Good Governance. Alison received her Bachelor of Arts in Modern History from Balliol College, Oxford University, her MA in International Relations from the University of Chicago, and MA in Organizational Psychology from Columbia University.

Alison's NYU webpage: https://www.stern.nyu.edu/faculty/bio/alison-taylor

Alison's personal website: https://www.alisontaylor.co

Follow Alison on LinkedIn: https://www.linkedin.com/in/followalisont/

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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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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 careers, the organization is now evolving toward a deeper goal: empowering individuals to become climate leaders—people who transform their companies, sectors, and communities from within—guided by the vision of a regenerative economic system.

Work on Climate homepage: https://workonclimate.org/

New focus on Regenerative Economics: https://workonclimate.org/2025/12/17/where-work-on-climate-is-headed/

Follow Eugene on LinkedIn: https://www.linkedin.com/in/eugenekirpichov/

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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://youtube.com/live/olcYG0LwJlw

Optimism Bias & Climate Change: https://youtu.be/XYb1T2-RmlQ

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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, Dakota has focused on developing frontier technologies with the potential for worldwide impact—while ensuring the risks they pose are addressed responsibly. Originally trained in biology and political science, she served as aide-de-camp to the CEO of Gavi, the Vaccine Alliance, where she supported negotiations with vaccine manufacturers and helped raise $10B to fund five years of vaccine programs in low- and middle-income countries. She was also founding Executive Director of ID2020, a global alliance committed to ethical, privacy-protecting digital identity and served as co-chair of both the WHO Smart Vaccine Certificate Working Group, which set international standards for COVID vaccination certificates, and the Good Health Pass Collaborative, a private-sector initiative (125+ companies) focused on resumption of international travel. Dakota holds a degree from Brown University and is a proud Californian.

Link to Reflective: https://reflective.org

Link to Dakota's op-ed in the Guardian: "We can safely experiment with reflecting sunlight away from Earth. Here’s how":

https://www.theguardian.com/commentisfree/2026/jan/06/reflecting-sunlight-climate-crisis-heating

Follow Dakota on LinkedIn: linkedin.com/in/dakotagruener

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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=a29768a646

Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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 all at once instead of being masked.

Francisco Estrada is a researcher at the Department of Environmental Economics, Institute for Environmental Studies (IVM), Vrije Universiteit Amsterdam. He also works in the Climate Change research group at the Center for Atmospheric Sciences of the Universidad Nacional Autónoma de México (UNAM). His PhD work centered on developing a new global Stochastic Integrated Assessment Model. He obtained a MSc on Risk Management from the Instituto Tecnológico Autónomo de México (ITAM). He was a contributing author for the Working Group II of the IPCC's Fourth Assessment Report and he has been selected as expert reviewer for the Working Group II contribution for the IPCC's Fifth Assessment Report. He has participated and coordinated research projects on the assessment of the potential impacts of climate change in agriculture, the economics of climate change and also on the generation of regional climate change scenarios.

His recent paper is "Economic assessment of SRM under socio-political and geophysical tipping dynamics":

https://iopscience.iop.org/article/10.1088/2752-5295/ae33df

An article about the paper appeared in New Scientist magazine: "Termination shock could make the cost of climate damage even higher":

https://www.newscientist.com/article/2513124-termination-shock-could-make-the-cost-of-climate-damage-even-higher/

Follow Francisco on X/Twitter: @festradaCCA

Climate Chat SRM/Solar-Geoengineering Playlist:

https://www.youtube.com/playlist?list=PLep9tQgCqjCoWPp-16Oxhjt9QPvtynzql

Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams

Please Like and Subscribe!

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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.copernicus.org/articles/16/939/2025/esd-16-939-2025.pdf

Climate Chat SRM/Solar-Geoengineering Playlist:

https://www.youtube.com/playlist?list=PLep9tQgCqjCoWPp-16Oxhjt9QPvtynzql

Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams

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-content/uploads/2026/01/Parasol-Lost-Final.pdf

Climate Chat programs are available here: https://www.youtube.com/@climatechat/streams

Please Like and Subscribe!

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 other climate funds and climate-focused non-profit groups. He started Climate Chat in 2021 on Clubhouse and added YouTube in 2023.

Follow Dan Miller on X/Twitter: @danmiller999

Follow Dan Miller on Bluesky: @danmiller999.bsky.social and @climatechat.bsky.social

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 acceleration in global warming. Leon's work has focused recently on changes in aerosol emissions from ships and the impact of those changes on climate change. You can access Leon's research writings here:

https://www.researchgate.net/profile/Leon-Simons

Follow Leon on X/Twitter: @LeonSimons8 and Bluesky: ‪@leonsimons.bsky.social‬

Follow Leon on Patreon: https://www.patreon.com/c/LeonSimons/home

Follow Stacey Randecker on X/Twitter: @DrivingMzStacey and Bluesky: @bikingmzstacey.bsky.social

Follow Eli Rabani on X/Twitter: @radsci and Bluesky: @radsci.bsky.social

You can leave a question in the YouTube Live chat. Please begin your question with "Question:" to make it easy for our mods to spot it.

For more Climate Chat episodes, see our YouTube home page:

https://www.youtube.com/@climatechat

For recent YouTube Live Climate Chat programs:

https://www.youtube.com/@climatechat/streams