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.

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
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1-25 of 117288 signatures
Number Date Name Location
117288 Fri Jul 01 06:44:17 EDT 2016 Simone Restelli Choose a State, ot , IT
117287 Thu Jun 30 21:50:57 EDT 2016 arleen whitmore San Leandro, CA , US
117286 Thu Jun 30 19:46:40 EDT 2016 Lisa Lolley Mulberry, FL , US
117285 Thu Jun 30 19:28:37 EDT 2016 g m Pacifica, CA , US
117284 Thu Jun 30 19:00:21 EDT 2016 Joanna Beaumont Riverside, IL , US
117283 Thu Jun 30 17:58:56 EDT 2016 Howie Sennet Washington, WA , US
117282 Thu Jun 30 17:18:25 EDT 2016 kerry Mccarthy California, CA , US
117281 Thu Jun 30 17:14:23 EDT 2016 ryk diemert perryville, MO , US
117280 Thu Jun 30 17:07:59 EDT 2016 Yael Shimshon Jerusalem, ot , IL
117279 Thu Jun 30 16:41:04 EDT 2016 Liz Field Acton, MA , US
117278 Thu Jun 30 16:05:05 EDT 2016 Dat Tran Upper Darby, PA , US
117277 Thu Jun 30 15:51:47 EDT 2016 Carol Yost New York, NY , US
117276 Thu Jun 30 14:37:55 EDT 2016 charmaine Breitengross Los Angeles, CA , US
117275 Wed Jun 29 20:33:39 EDT 2016 Marcelo Thurman Chicago, IL , US
117274 Wed Jun 29 14:28:50 EDT 2016 Andrew Weaver CA, CA , US
117273 Wed Jun 29 12:18:00 EDT 2016 Anonymous east, PA , US
117272 Sun Jun 26 14:29:14 EDT 2016 Sandra flemisch Dossenheim , ot , DE
117271 Sun Jun 26 07:06:19 EDT 2016 Carol Garde Sunrise, FL , US
117270 Sun Jun 26 07:05:59 EDT 2016 Audrey Vales Sèvres, ot , FR
117269 Sat Jun 25 23:35:14 EDT 2016 Bonnie Turnbull South Lake Tahoe, CA , US
117268 Sat Jun 25 21:28:45 EDT 2016 kent lennox san francisco, CA , US
117267 Sat Jun 25 09:52:51 EDT 2016 Isaac Wollman San Luis Obispo, CA , US
117266 Sat Jun 25 00:33:47 EDT 2016 Jeremy Wales Evansville, MN , US
117265 Fri Jun 24 12:46:01 EDT 2016 Martha F. Hoar Shelburne, VT , US
117264 Fri Jun 24 12:37:47 EDT 2016 MERI ROEDER WI, WI , US
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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.

Smokestacks photo courtesy NASA.