Erin Brockovich

Consumer Advocate, Author, TV Host & Environmental Activist

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

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

Daniel Esty

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

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

Buck Brannaman

The Horse Whisperer

Willie Smits

Trained Forester, Microbiologist, Conservationist, Animal Rights Activist, Wilderness Engineer & Social Entrepreneur

Elayne Boosler

Comedian & Advocate for Animal Rescue; Founder of Tails of Joy

Mark Z. Jacobson

Director of the Atmosphere/Energy Program & Professor of Civil and Environmental Engineering at Stanford University

Dave Salmoni

Animal Planet Television Personality & Large Predator Expert

Denis Hayes

Organizer of the First Earth Day; CEO of The Bullitt Foundation

Charlie Hamilton-James

Photographer & Wildlife Conservationalist

Jarod Miller

Naturalist, Zoologist & Television Host

Dr. Jan Pol

Veterinarian; Star of Nat Geo Wild's "The Incredible Dr. Pol"