Aaron Hirschhorn

Co-Founder & CEO at DogVacay

Achmat Hassiem

Shark Attack Survivor, Paralympic Swimmer & Global Shark Guardian

Aditi Mayer

Keynote Speaker on Sustainability, Fashion, Environment & Social Justice

Adrian Grenier

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

Alan Cumming

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

Aldo Kane

World Record Setting Adventurer; Fellow at the Royal Geographic Society, Author & TV Presenter

Alejandro Durán

Artist Who Collects Trash From the Oceans and Turns It Into Disquieting Works of Art

Alex Honnold

Professional Rock Climber & Star of the Academy-Award Winning Documentary "Free Solo"

Alex Schulze

Co-Founder & CEO of 4ocean; Advocate for Ocean Cleanup, Conservation & Sustainability

Conversation with Alex Schulze, CEO and Co-Founder of 4ocean

Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Alexandra Horowitz

Professor of Psychology, Animal Behavior, and Canine Cognition; Bestselling Author of "Inside of a Dog: What Dogs See, Smell and Know"

Alice Waters

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

Alicia Silverstone

Actress & 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"

Amali Tower

Climate Displacement, Migration & Refugee Expert; Founder of Climate Refugees

Q&A: Amali Tower on Climate Migration and 'Evolution Earth'

Amber Jenkins

Applied Science Engineer, NASA’s Jet Propulsion Laboratory; Editor, NASA Climate Change Website

Amy Smart

Actress, Environmentalist & Co-Founder of Smart House Collections

Andrés Ruzo

Geothermal Scientist & Amazon Conservationist

Anna Paquin

Actress Best Known for "True Blood" and for the X-Men Franchise