Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Danny Trejo

Actor, Author, Activist & Restaurateur; Recovery & Intervention Counselor for Troubled Youth

Sophia Bush

Actress, Humanitarian & Author

Tim Gunn

Fashion Icon, Former Co-Host & Mentor of "Project Runway"

Robert Ballard

Renowned Ocean Explorer & Scientist

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

Adrian Grenier

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

Laura Dern

Actress, Director, Producer & Activist

Kesha

Pop Singer Known For "Tik Tok," "Your Love Is My Drug" & "Praying"

David Suzuki

Environmentalist & Scientist; Co-Founder of the David Suzuki Foundation

Alicia Silverstone

Actress & Animal Rights Activist

Leland Melvin

Engineer, Former NASA Astronaut & Former NFL Wide Receiver

Moby

Musician, DJ, Photographer

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

Lisa Vanderpump

Entrepreneur, TV Personality, Author & Philanthropist

Lisa Vanderpump Tells Us About Her First Times

Hayden Panettiere

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

Alison Victoria

Interior Designer; Host of HGTV's "Kitchen Crashers"

Alyssa Milano

Actress, Author, Philanthropist & Founder of Touch by Alyssa Milano; Known for "Charmed" and "Who's the Boss"

Alan Cumming

Emmy-Winning Actor Who Stars in "The Good Wife"

Daryl Hannah

Actress, Best Known for "Kill Bill" & "Splash"; Environmental Activist