Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Erin Brockovich

Consumer Advocate, Author, TV Host & Environmental Activist

Amanda Beard

Olympic Gold Medalist, Co-Founder of Beard Swim Co. & Author of New York Times Bestseller "In the Water They Can't See You Cry"

Alice Waters

Executive Chef, Founder & Owner of Chez Panisse; Sustainable Agriculture Advocate

Danny Trejo

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

Dr. Sylvia Hood Washington

Chief Environmental Research Scientist at Environmental Health Research Associates, LLC.

Ellen DeGeneres

Award-Winning Comedian, TV Host, Actress & LGBTQ Activist

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Tim Gunn

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

Katharine Hayhoe

Atmospheric Scientist, Professor of Political Science & Director of Climate Science Center at Texas Tech, Lead Scientist with The Nature Conservancy

Saving Us: A Climate Scientist's Case for Hope and Healing in a Divided World

Jillian Michaels

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

Rachael Ray

Chef, Cookbook Author & Television Host Known for the "Rachael Ray Show"

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Alicia Silverstone

Actress & Animal Rights Activist

Kesha

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

Bill Maher

Political Satirist & Host of HBO's "Real Time"

Daphne Frias

Climate Change, Disability & Environmental Activist

Tala Dowlatshahi

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

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Doug Fine

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