Achenyo Idachaba

Head of MitiMeth, A Nigeria-Based Environmentally Aware Production Company

Achim Steiner

Director of the Oxford Martin School; Former Executive Director of the United Nations Environment Programme

Adam James

Co-Founder of Clean Energy Leadership Institute; Authority on Renewable Energy & Public Policy

Adele Morris

Fellow and policy director for Climate and Energy Economics at the Brookings Institution

Adria Vasil

Author of Ecoholic, Leading Environmental Columnist.

Afra Majid Alowais

Chief Efficienology Officer, SEWA

Aimee Witteman

Deputy Assistant Secretary for Intergovernmental Affairs at U.S. Department of Energy

Alasdair Harris

Ocean Conservationist & Entrepreneur

Alastair Sweeny

Alastair Sweeny is a business historian and futurist based in Ottawa, Canada.

Aldyen Donnelly

Co-Founder & Director of Carbon Economics at Nori

Alec Manfre

CEO and Co-founder at Bractlet

Alex Epstein

Founder, Center for Industrial Progress Author, Fossil Fuels Improve the Planet

Alex Nowrasteh

Alex's op-eds have appeared in The Wall Street Journal, The Houston Chronicle, The Boston Globe, Investor's Business Daily, and numerous other newspapers.

Alexander A. Likhotal

President of Green Cross International & Former Adviser to Mikhail Gorbachev

Alexei Arbatov

Academician and professor of the Academy of Defense, Security and Police by the President of Russia and Vice chairman of the YABLOKO party

Ali Al Jassim

CEO, Etihad Energy Services

Ali Hajimiri

Bren Professor of Electrical Engineering & Medical Engineering; Co-Director of the Space-Based Solar Power Project

How Wireless Energy From Space Could Power Everything | Ali Hajimiri | TED

Ali Izadi-Najafabadi

Head of Intelligent Mobility, Bloomberg

Allison Anderson

Nonresident fellow with the Brookings Institution’s Center for Universal Education

Allison Blankenship

Award-Winning Communications Architect, and Author

Amanda Brock

Chief Executive Officer WATER STANDARD

Amanda Little

Professor of Investigative Journalism and Science Writing at Vanderbilt University; Author of "The Fate of Food: What We'll Eat in a Bigger, Hotter, Smarter World"

Amar Inamdar

Investor, Advisor, & Clean Energy Advocate; Managing Director of KawiSafi Ventures

Ambassador Munir Akram

Former Permanent Representative to the UN from Pakistan

Amin Toufani

CEO of T Labs, Creator of Adaptability.org, Chair for Finance & Economics at Singularity University

Amory Lovins

Co-Founder & Chairman Emeritus of Rocky Mountain Institute

Amy Francetic

Managing General Partner at Buoyant Ventures

Amy Harder

Climate Change Journalist & Executive Editor of Cipher by Breakthrough Energy

Amy Liu

Presidential Advisor and Senior Fellow, The Brookings Institution

Amy Myers Jaffe

Leading Expert on Global Energy Policy & Sustainability

Amy Myers Jaffe: TEDx Energy Policy