Willie Nelson

Country Music Singer-Songwriter Known for "On The Road Again" & "Always On My Mind"

Dr. Tierney Thys

Marine Biologist, Educator & Filmmaker

Tala Dowlatshahi

Award-Winning Global Human Rights, Climate Change & Public Health Policy Expert; Former Senior Advisor for Stakeholder Engagement at the United Nations

Bernadette Beck

Founder & CEO of Kindle Coffee & 1 for 1 Foundation; Actress & Journalist Known for "Riverdale"

Marla Spivak

Entomologist; Focused on Practical Applications to Protect Honey Bee Populations

Rick Ridgeway

Environmentalist, Mountaineer, Expedition Author, Former VP of Environmental Initiatives & Special Projects at Patagonia

David Doubilet

National Geographic Photographer & Founding Member of the International League of Conservation Photographers

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Chad Pregracke

Founder of Living Lands & Waters, CNN's Hero of the Year for 2013, Environmental Speaker & Bestselling Author

Lisa Vanderpump

Entrepreneur, TV Personality, Author & Philanthropist

Lisa Vanderpump Tells Us About Her First Times

Louie Psihoyos

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

Doug Fine

Globe-Trotting Journalist, Award-Winning Climate Correspondent, Goat-Herder & Author

Olivia Munn

Television & Film Actress; Known for "Newsroom" & "X-Men: Apocalypse"

Olivia Munn on Jon Stewart | 2022 Mark Twain Prize

Catherine Coleman Flowers

Climate Justice Activist; Founding Director of the Center for Rural Enterprise and Environmental Justice

Catherine Coleman Flowers - Climate Business Innovation Summit

Kimi Werner

Freedive-Spearfishing Champion, Certified Chef & Award-Winning Environmentalist

Lamman Rucker

Actor, Education Activist, Green Living Advocate & Entrepreneur

Kate Brandt

Lead for Sustainability at Google & Former Chief Sustainability Officer for the Obama Administration

Mark Z. Jacobson

Director of the Atmosphere/Energy Program & Professor of Civil and Environmental Engineering at Stanford University

Pink

Singer-Songwriter, Actress, Philanthropist & Environmental Activist

Hayden Panettiere

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