Katharine Hayhoe

Atmospheric Scientist, Professor of Political Science & Director of Climate Science Center at Texas Tech, Chief Scientist with The Nature Conservancy

Dr. Sylvia Hood Washington

Founder & Chief Environmental Research Scientist for Environmental Health Research Associates, LLC; Founder & Director, One Drop Rule Rare Disease Foundation

Dr. Jonathan Foley

World Leading Climate Scientist & Executive Director of Project Drawdown

Winona LaDuke

Environmental Activist & Author; Climate Justice, Renewable Energy & Sustainability Advocate; Executive Director of "Honor the Earth"

Alexandra Cousteau

Environmental Activist, Ocean Advocate & Storyteller; Co-Founder, Oceans2050 & Senior Advisor, OCEANA

John Holdren

Professor of Environmental Policy & Director of the Program on Science, Technology & Public Policy at the Harvard Kennedy School of Government

Tensie Whelan

Director of NYU's Center for Sustainable Business; Former President of the Rainforest Alliance

Tom Rand

Entrepreneur, Venture Capitalist & Author

Bob Kopp

Climate Scientist, Geobiologist & Climate Policy Scholar at Rutgers University

Mark Ruffalo

Golden Globe-Winning Actor, Director, Screenwriter & Environmental Activist

Martin Eberhard

Founder & Former CEO of Tesla; Retired Entrepreneur & Inventor

Don Cheadle

Actor, Activist & Author; Known for "Iron Man 2" & "Hotel Rwanda"

ACE Universe Presents: A Conversation with Don Cheadle - YouTube

Michael Shellenberger

Founder & President of Environmental Progress; Expert on Energy, Climate, Security, Human Development & Politics

Jamie Margolin

Climate Change Activist; Founder & Co-Executive Director of Youth-Led Climate Action Group Zero Hour; Author of "Youth to Power"

As Teenagers, They Protested Trump’s Climate Policy. Now What?

Ramez Naam

Computer Scientist, Science Fiction Author & Co-Chair of Energy & Environment at Singularity University

Chris Turner

Author, Sustainability & Global Cleantech Expert

Christiana Figueres

Expert on Global Climate Change; Former Executive Secretary of the UN Framework Convention on Climate Change

Gonzalo Delacámara

Director of the IE Center of Water & Climate Adaption; Global Expert in Climate Change Adaption & Authority in Sustainability & Natural Resources

Chante Harris

Global Climate Strategist, Operator & Investor

Tom Steyer

Business Leader; Philanthropist & Clean Energy Advocate; Co-Founder, NextGen America & Galvanize Climate Solutions; Author, "Cheaper, Faster, Better"; Former 2020 Presidential Candidate