Erin Brockovich

Consumer Advocate, Author, TV Host & Environmental Activist

Adrian Grenier

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

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Ellen DeGeneres

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

Mark Bittman

Former NYT Writer; Author of "How to Cook Everything" Series; Host of "Food with Mark Bittman"

Jack Hanna

Naturalist, Adventurer & Director Emeritus of the Columbus Zoo

Sylvia Earle

Explorer-in-Residence at National Geographic & Oceanographer; Former Chief Scientist of the NOAA

Doug Fine

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

Peter Gleick

Co-founder & President of the Pacific Institute for Studies in Development, Environment & Security

The Three Ages of Water

Charlize Theron

Academy Award-Winning Actress; Best Known for "Monster" & "Mad Max: Fury Road"

Laura Dern

Actress, Director, Producer & Activist

Daniel Esty

Hillhouse Professor of Environmental Law and Policy at Yale Law School, Corporate Environmental Strategy Expert & Co-Author of "Green to Gold"

Edie Falco

Actress, Known for "The Sopranos" & "Nurse Jackie"

Carrie Ann Inaba

"Dancing with the Stars" Judge, Founder of Carrie Ann Inaba Animal Project

Kristen Bell

Actress & Film Producer; Known for "Veronica Mars" & "Frozen"

David Duchovny

Actor, Writer & Director Known for "The X-Files," "Aquarius" & "Californication"

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Ian Dunbar

World Famous Veterinarian, Dog Trainer, and Writer

Mark Moffett

Entomologist, Nature Photographer & Author

Brian Skerry

National Geographic Magazine Photographer, Specializing in Marine Wildlife & the Underwater World; Exploration & Conservation Speaker