Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Leilani Munter

Professional Race Car Driver & Environmental Activist

Carl Pope

Senior Advisor to UN Envoy for Cities and Climate; Former CEO and Chairman of the Sierra Club

David Crane

Strategic Advisor Executive at Pegasus Capital Advisors; Former President & CEO of NRG Energy, Inc.; Climate Advocate

Shahram Chubin

Nonresident senior associate in the Carnegie Nuclear Policy Program. Based in Geneva, Chubin’s research focuses on nonproliferation, terrorism, and Middle East security issues.

Alastair Sweeny

Alastair Sweeny is a business historian and futurist based in Ottawa, Canada.

Billy Tauzin

CEO, Pharm. Research and Manufacturers of America

Lynn Jurich

Co-Founder & CEO of SunRun

Natalie Jeremijenko

Artist and engineer, studies in biochemistry, physics, neuroscience and precision engineering

David de Rothschild

Environmentalist, Adventurer & Founder of Sculpt the Future Foundation

Rex Tillerson

Former U.S. Secretary of State, Former Chairman and Chief Executive Officer of ExxonMobil

Hayden Panettiere

Actress Known for "Nashville" & "Heroes" & Animal Rights Activist

Fatih Birol

Executive Director of the International Energy Agency

Michael Moynihan

CEO of Onehot.ai & Author

Tim Jackson

Ecological Economist, Playwright & Director of the Centre for the Understanding of Sustainable Prosperity

Nick Lowery

Former NFL Placekicker .

Laurie David

Producer, Activist Author,The Family Dinner: Great Ways To Connect With Your Kids One Meal At A Time

Christiana Figueres

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

Naomi Oreskes

Geologist & Earth Science Historian

David Trimble

Director of Natural Resources and Environment at the Government Accountability Office.

Emmanuelle Chriqui

Actress Known for "Entourage;" Social Advocate for Colon Cancer, Environmental Issues & Human Rights in Congo

Iain Murray

Vice President for Strategy, Competitive Enterprise Issue

Christopher C. Horner

Former Senior Fellow at the Competitive Enterprise Institute, Attorney & Climate Change Denial Activist

Lyndon Rive

Founder and CEO, SolarCity

Ian Johnston

'Bang Goes The Theory' & 'Battle of The Geeks Consultant' And Academic Engineer

Louie Psihoyos

Photographer & Documentary Film Director Known for the Academy Award-Winning Documentary "The Cove"

Angélique Kidjo

UNICEF Goodwill Ambassador, Singer & Songwriter

John Podesta

Founder of the Center for American Progress

Fireside Chat with John Podesta

Colin Beavan

Eco-Leader, Executive Director of The No Impact Project Author & Spokesperson

Sebastian Mallaby

Director of the Maurice R. Greenberg Center for Geoeconomic Studies and the Paul A. Volcker Senior Fellow for International Economics at the Council on Foreign Relations

The Power Law: Venture Capital and the Making of the New Future