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Adrian Grenier

Actor Known for HBO's "Entourage"; Environmental Activist; UN Ambassador

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Peter Diamandis
(1 rating)

Founder & Executive Chairman of the XPRIZE Foundation; Author; Named One of The World's 50 Greatest Leaders

Van Jones
(5 ratings)

CEO of REFORM Alliance, CNN host, Emmy Award-winning Producer & NY Times Best-Selling Author

Patricia Arquette

Academy Award-Winning Actress, Activist, Humanitarian & Author

Don Cheadle

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

Jeff Orlowski

Award-winning Filmmaker, Photographer, Entrepreneur & Climate Change Activist

Dr. Jane Goodall

Internationally Renowned Primatologist, Founder of the Jane Goodall Institute & UN Messenger of Peace

Sir Richard Branson
(1 rating)

Businessman & Founder of Virgin Group

Ken Burns
(1 rating)

Historian & Award-Winning Documentary Filmmaker

Cate Blanchett

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

Will Smith
(1 rating)

Actor, Producer, Entrepreneur, Philanthropist & Author

Mayim Bialik
(3 ratings)

Neuroscientist & Actress, Known For "The Big Bang Theory"

Ashton Kutcher
(1 rating)

Actor, Producer, Investor & Activist

Bindi Irwin

Wildlife Conservationist & Daughter of Steve Irwin; Season 21 Contestant on "Dancing With the Stars"

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Jessica Alba
(1 rating)

Actress; Entrepreneur; Founder & CEO of The Honest Company