Center for     Biological     Diversity   

People's Petition to Cap Carbon Dioxide Pollution at 350 Parts Per Million


Prominent climate researchers have warned that we must reduce the level of atmospheric carbon dioxide to 350 parts per million (ppm) or below in order to stabilize climate change and avoid global catastrophe. The Center for Biological Diversity, along with Bill McKibben's group, is advocating strongly for this necessary standard.

While carbon dioxide isn't the only global warming pollutant we need to control, it's the number-one contributor to climate change.

Please join us in moving toward a real solution to the climate crisis by calling on the U.S. Environmental Protection Agency to do its job as science, the law and common sense require.

Sign the People's Petition to Cap Carbon at 350 Parts Per Million today.

Several lines of evidence show that allowing atmospheric carbon dioxide levels to remain above 350 ppm for a sustained period of time will lead to dangerously acidic oceans, runaway global warming, and melting of the polar ice caps. Such a climate would be well outside anything experienced in the history of the human species, and would carry with it irreversible cascades of species extinctions and significant dangers for human civilization.

What's needed is an immediate reduction of atmospheric carbon dioxide, with the goal of an overall concentration of 350 ppm or less to be achieved as quickly as possible. To accomplish that, the Center supports the rapid phasing out of all coal-fired power plants; the highest technologically feasible vehicle-mileage standards; and a ban on extreme energy development like Arctic drilling, tar sands and fracking, among other critical measures.

I support the legal petition filed by the Center for Biological Diversity and to the EPA to cap atmospheric carbon dioxide levels at 350 parts per million -- the level science says is necessary to avoid the worst impacts of global warming -- under the Clean Air Act.

For four decades, the Clean Air Act has protected the air we breathe through a proven, successful system of pollution control that saves lives and creates economic benefits exceeding its costs by many times. It's time to fully use one of our strongest existing tools for reducing greenhouse gas pollution: the Clean Air Act.

Now is the time to enforce the Act, not gut it. I urge you to move swiftly to grant the petition and enforce the Clean Air Act.


Dr. James Hansen, Climate Scientist
Bill McKibben, Founder, Author
Ed Begley, Jr., Activist /Actor
Bonnie Raitt, Musician / Activist
Barbara Kingsolver, Author
Doug La Follette, Wisconsin Secretary of State
Dr. Helen Caldicott, Anti-Nuclear Activist
ChiQ Simms, Navigation Foundation
Dr. Michael Dorsey, Director- Sierra Club National Board
Brock Evans, President- Endangered Species Coalition
Dinah Bear, Attorney-at-Law
Curtis Moore, Author and former Republican Counsel, Committee on Environment and Public Works, U.S. Senate
Dr. Thomas Lovejoy, Biodiversity Chair, Heinz Center
Dr. Niles Eldredge, Curator in the Department of Invertebrates, American Museum of Natural History
Dr. John Terborgh, Research Professor Emeritus and Director, Center for Tropical Conservation, Duke University
Jonathan Baker, Co-founder, Sol Sage
Joshua Beckman, Poet
Kate Bernheimer, Author
Elise Blackwell, Author
Adam Braver, Author
Alan Cheuse, Author
Ron Currie, Jr., Author
Kathryn Davis, Author
Alison Deming, Author
Jay Driscoll, of band Barefoot Truth
Rikki Ducornet, Author
Ben Edlund, TV Writer and Comic-book Artist
Jennifer Egan, Author
Daniel Handler, Author
Oliver Houck, Author and Professor of Law, Tulane University
Alex Irvine, Author
Anna Lappe, Author, Small Planet Institute
Jonathan Lethem, Author
Victor Lodato, Author
Alec Loorz, Founder, Kids vs. Global Warming
Victoria Loorz, Co-Founder, Kids vs. Global Warming
Ben Marcus, Author
Lydia Millet, Author
Rick Moody, Author
Jenny Offill, Author
Zyg Plater, Professor of Law, Boston College Law School
Dr. Melissa Savage, Professor Emeritus, University of California Los Angeles
Aurelie Sheehan, Author
Darcey Steinke, Author
Darin Strauss, Author
Donna Tartt, Author
Lynne Tillman, Author
Fred Tomaselli, Artist
Harvey Wasserman, author of SOLARTOPIA! Our Green-Powered Earth, A.D. 2030
Don Waters, Author
Eric Zencey, Visiting Associate Professor of Historical and Political Studies, Empire State College
Luanne Rice, Author
Mike Tidwell, Director, Chesapeake Climate Action Network
Optional Member Code

1-25 of 111366 signatures
Number Date Name Location
111366 Sat Jan 21 15:43:11 EST 2017 Jeannine Murphy Monterey, CA , US
111365 Sat Jan 21 04:30:30 EST 2017 Tom Canning Calabasas, CA , US
111364 Sat Jan 21 00:05:19 EST 2017 Kathleen Lewis Kiowa, CO , United States
111363 Fri Jan 20 17:40:57 EST 2017 Jeannette Welling California, CA , US
111362 Fri Jan 20 16:42:22 EST 2017 Anonymous PA, PA , US
111361 Fri Jan 20 15:57:21 EST 2017 André Henrique Bacci Cambuquira, Minas Gerais , BR
111360 Fri Jan 20 12:15:01 EST 2017 Cj Gainer Washington, WA , US
111359 Fri Jan 20 12:15:01 EST 2017 Cj Gainer Washington, WA , US
111358 Fri Jan 20 10:01:31 EST 2017 Debra Cassiero Sonoma, CA , US
111357 Fri Jan 20 00:29:00 EST 2017 michele rule concord, NH , US
111356 Thu Jan 19 15:06:45 EST 2017 michael hughes Paradise Valley, AZ , US
111355 Thu Jan 19 14:39:09 EST 2017 Anonymous Marietta, GA , US
111354 Wed Jan 18 21:56:40 EST 2017 mauricio carvajal Santiago, ot , CL
111353 Wed Jan 18 11:57:36 EST 2017 Gary Hileman Hesperia, CA , US
111352 Tue Jan 17 22:51:00 EST 2017 Jacki Hileman Hesperia, CA , US
111351 Tue Jan 17 19:22:13 EST 2017 Jamie Conrad San Leandro, CA , US
111350 Tue Jan 17 17:42:10 EST 2017 Pam Shaouy Woodstock, GA , US
111349 Tue Jan 17 17:19:15 EST 2017 Jackie Bear Los Angeles, CA , US
111348 Tue Jan 17 16:52:52 EST 2017 Tina deKwaadsteniet Los Angeles, CA , US
111347 Tue Jan 17 12:42:39 EST 2017 kajsa ingelsson west h0llywod, CA , US
111346 Tue Jan 17 11:53:33 EST 2017 Michelle Carter San Francisco, CA , US
111345 Mon Jan 16 23:24:17 EST 2017 Anonymous South Gate, CA , US
111344 Mon Jan 16 19:54:42 EST 2017 Seb Villani Chula Vista, CA , US
111343 Mon Jan 16 18:54:19 EST 2017 Jennifer Hayes Modesto, CA , US
111342 Mon Jan 16 18:24:21 EST 2017 Laura Newton Cathedral City, CA , US
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Please take action by Jan. 20, 2017.

Photo of smokestack courtesy NASA.

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