Jason Momoa

Actor, Director & Environmental Activist; Known for "Game of Thrones" & "Aquaman"

Rose Marcario

Former President and CEO of Patagonia; Partner at ReGen Ventures

Matt Damon

Actor, Screenwriter & Producer; Co-Founder of Water.org; Expert Advocate on Global Water & Sanitation Crisis

Jessica Alba

Actress; Entrepreneur; Founder & CEO of The Honest Company

Alanis Morissette

Alt-Rock Angst Icon Known for "You Oughta Know" & "Ironic"

Stella McCartney

Fashion Designer, Founder, Stella McCartney

James Cameron

Filmmaker, Artist, Environmentalist

Al Gore

45th Vice President of the United States, Nobel Peace Laureate & Bestselling Author

Cate Blanchett

Academy Award-Winning Actress Known for "Elizabeth" & "The Aviator;" Ambassador for the Australian Conservation Foundation

Olivia Munn

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

Olivia Munn on Jon Stewart | 2022 Mark Twain Prize

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Edward Norton

Award Winning Actor & Filmmaker

Leonardo DiCaprio

Award-Winning Actor & Environmentalist

Jake Gyllenhaal

Academy Award-Nominated & BAFTA Award-winning Actor; Environmental Activist

Pierce Brosnan

Actor, Producer & Activist; Best Known for His Role as James Bond

Pink

Singer-Songwriter, Actress, Philanthropist & Environmental Activist

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Bono

Lead Singer of U2, Activist & Co-Founder of DATA (Debt, AIDS, Trade, Africa)

Maroon 5

American Pop/Rock Band Known for the Hit Singles, "Maps," "Love Somebody" & "Misery"

Alex Honnold

Professional Rock Climber & Star of the Academy-Award Winning Documentary "Free Solo"