Geoffrey Supran is a Research Associate at Harvard University, and co-author of Assessing ExxonMobil's Climate Change Communications (1977–2014). We discuss what ExxonMobil knew about climate change, its relentless campaign to deny the reality of climate science, and the importance of speaking truth to power.

Fred Pearce is the author of Fallout: Disasters, Lies, and the Legacy of the Nuclear Age, and has reported on environmental, science, and development issues from 88 countries over the past thirty years. We discuss the legacy of secrecy surrounding nuclear technology, the true cost of waste management, and whether we're nearing the end of the Nuclear Era.

Ken Buesseler is a marine radiochemist at the Woods Hole Oceanographic Institution who studies the fate and distribution of radioactive elements in the ocean. We discuss the safety of the Pacific Ocean, the natural occurence of radioactivity in our environment, and a citizen scientist project for oceanic testing.

Mark Z. Jacobson is a Professor of Civil and Environmental Engineering and Senior Fellow of the Stanford Woods Institute for the Environment. We discuss the various practical problems that make nuclear energy not a viable solution for decarbonization, which renewable sources work better, and why electrifying our lives is a big part of the solution.

Joshua Goldstein is a political scientist, nuclear advocate, and co-author of Bright Future, How Some Countries Have Solved Climate Change and the Rest Can Follow. We discuss why we should be thinking of nuclear as a clean alternative to coal, and how nuclear energy could be the technology for rapid decarbonization and a green future.

Jojo Mehta is the co-founder and director of Ecological Defense Integrity, a non-profit organization working to establish ecocide as a core international crime under the Rome Statute of the International Criminal Court. We discuss the power of criminalizing ecocide in order to change the behavior of corporate perpetrators.

Leah Stokes is a professor at UCSB and the author of Short Circuiting Policy. She works on energy, climate and environmental politics. We talk about the successes and failures of clean energy policy in the US, and how energy companies are fighting back against decarbonizing the energy system.

Jerry Taylor is the President and co-founder of the Niskanen Center, a non-partisan think tank that works to promote an open society. We talk about his conversion from climate denier to climate advocate, working behind the scenes to persuade Republican lawmakers to act on climate change, and why a carbon tax is the most effective public policy to do so.

Jussara Lee is a renowned fashion designer living in New York City. She promotes ‘slow fashion’, hand-made garments, as well as reusing and recycling clothing. We talk about the high cost of fast fashion, our purchasing power as consumers, and the future of sustainable fashion.

Lenore Newman holds the Canada Research Chair in Food Security and Environment at the University of the Fraser Valley. Her latest book is Lost Feast: Culinary Extinction and the Future of Food. We discuss achieving food security through better management of food supplies, which include eating lower on the food chain and using technology such as artificial meats.

Katherine Richardson is the Leader of the Sustainability Science Centre at the University of Copenhagen and a Professor of Biological Oceanography. We discuss the needs of billions of people for food and energy, finding solutions within our finite resources, and tipping points in climate and in societal behavior.

Hannah McCarthy and Nick Capodice host Civics 101, the podcast refresher course about the basics of how American democracy works. We discuss the importance of empowering citizens and understanding the rules of our complex system, as well as the enduring repercussions of slavery in the United States.

Louise Dubé is the Executive Director of iCivics, an organization whose mission is to cultivate a new generation of students for thoughtful and active citizenship. We discuss the critical importance of high-quality civics education, the role of iCivics games in effective learning, and the necessity for robust investment and legislation in this space.

Jonathan Lamontagne is a professor of civil and environmental engineering at Tufts University School of Engineering. In his recent study, he finds that immediate global action is required for robust climate abatement. We discuss the narrow window that still remains for both a tolerable climate future and tolerable economic conditions.

Melissa Mark-Viverito is the former Speaker of the New York City Council and co-founder of the 21 in ’21 Initiative. She argues that electing women into government is critical for our society and democracy because their perspectives and experiences need to be represented in budgets, public policy, and legislation.

Cristóbal Alex is the President of Latino Victory, an organization that is augmenting Latino political power by empowering the community’s voters, donors, and candidates. We discuss why it is essential to increase Latino representation in government and how a more inclusive politics benefits all Americans.

Ashley Allison is the Executive Vice President of Campaigns and Programs at The Leadership Conference, the nation’s premier civil and human rights coalition. We discuss how the census is a cornerstone of our democracy. The data it provides is vital for delivering the resources and services that are necessary to sustain thriving communities.

Esther de Rothschild is the founder of The Love Vote, a platform where people who cannot vote, mobilize those who can. Together with Outreach Director Aicha Cherif, we discuss how love can be a strong motivator for voting. Eligible voters are moved to vote on behalf of their loved ones and give collective action a powerful boost.

Brent Wilkes is the former CEO of the League of United Latin American Citizens (LULAC) and a lifelong advocate for Latino rights. We discuss what fair and comprehensive immigration could be, the positive contribution by immigrant labor to the US economy, and how we can demand sound immigration policy at the ballot box.

Mark Hetfield is the President and CEO of HIAS, the oldest refugee assistance organization in operation. We discuss our humanitarian obligations to refugees, the tremendous benefits that they bring to American society, and bust the misconceptions about the current refugee situation in the US.