Chad Pregracke

Founder of Living Lands & Waters, CNN's Hero of the Year for 2013, Environmental Speaker & Bestselling Author

Mark Tercek

Former President & CEO of The Nature Conservancy

John Passacantando

Former Executive Director of Greenpeace USA

Tim Jackson

Ecological Economist, Playwright & Director of the Centre for the Understanding of Sustainable Prosperity

Ron Pernick

Co-Founder & Managing Director of Clean Edge, Inc.

Khalida Brohi

Indigenous Entrepreneur, Author, Storyteller & Women's Empowerment Speaker

Joe Hanson

Science Writer, Biologist, Video Producer & Educator

Naomi Oreskes

Geologist & Earth Science Historian

Harvey Wasserman

Journalist, Author, Democracy Activist & Advocate for Renewable Energy

Katie Spotz

World Record-Breaking Endurance Athlete & Safe Water Activist

Pat Wood

CEO of the Hunt Energy Network; Former Chairman of the Federal Energy Regulatory Commission

Christine Ervin

Former US Assistant Secretary of Energy; National Leader on Green Buildings & Clean Energy

James Barbour

Press Secretary at the British Embassy, Washington DC, and Head of Communications for the UK Government across the United States

Shel Horowitz

Green Guerrilla Marketer, National Environmental Hall of Fame, Social Activist, and Author

Robert Swan

Polar Explorer & Environmentalist; First Man Ever to Walk Unsupported to Both Poles

Robert Muggah

Specialist in Smart and Green Cities, Geopolitics, Public Safety, and Cybersecurity; Co-Founder of Social Policy Think Tank Igarapé Institute & The SecDev Group

Terra Incognita: 100 Maps to Survive the Next 100 Years

Bill Weir

CNN Anchor, Chief Climate Correspondent, Former Host & Executive Producer of the Acclaimed CNN Original Series "The Wonder List with Bill Weir"

Life as We Know It (Can Be): Stories of People, Climate, and Hope in a Changing World

Fatih Birol

Executive Director of the International Energy Agency

Frans Lanting

Wildlife Photographer

Andrew Hoffman

Holcim (US) Professor of Sustainable Enterprise at the University of Michigan