Mark Lynas

Environmental Writer; Author of "Our Final Warning: Six Degrees of Climate Emergency"

Walter Robb

Food Retail Expert & Food Access Advocate; Principal at Stonewall Robb Advisors; Former Co-CEO of Whole Foods Market

Jason Clay

Senior Vice President of Food & Markets at WWF

Alice Waters

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

Dennis Avery

Former Director, Center for Global Food Issues at the Hudson Institute

Dan Barber

Multi-Award-Winning Chef, Agronomist, Environmentalist, Author & Co-Owner of New York's Blue Hill Restaurant

Dan Barber - From Seed to Table - Aspen Ideas: Health 2023

Raj Patel

Award-Winning Writer, Food Politics Activist, Filmmaker & Academic

Winona LaDuke

Executive Director of Honor the Earth

Novella Carpenter

Journalist & Best-selling Author of "Farm City: The Education of an Urban Farmer"

Gary Hirshberg

Co-Founder & Chief Organic Optimist of Stonyfield Farm

Louise Fresco

Food & Agriculture Expert, Advisor on Sustainability

Carl Pope

Senior Advisor to UN Envoy for Cities and Climate; Former CEO and Chairman of the Sierra Club

James E. Hansen

Adjunct Professor Directing the Program on Climate Science, Awareness and Solutions of the Earth Institute at Columbia University; Former Director at NASA Goddard Institute for Space Studies

Marshall Brain

Author & Founder of HowStuffWorks

Will Allen

Pioneer in the Urban Farming Movement, Author & Founder of Growing Power

Penelope Boston

Speleologist; Associate Director of the National Cave and Karst Research Institute

Bruce Vincent

Agriculture Activist and Motivational Speaker

David Trimble

Director of Natural Resources and Environment at the Government Accountability Office.

Tristram Stuart

Environmental Campaigner, Author & Businessman

Dr. Phil Plait

Blogger for Discover Magazine at Bad Astronomy, where he deconstructs misconceptions and explores the wonder of the Universe.