Center for Biological Diversity

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

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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 take one minute to 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 114299 signatures
Number Date Name Location
114299 Thu Aug 28 20:58:27 EDT 2014 Lucinda Greene Harrison Valley, PA , US
114298 Thu Aug 28 20:23:14 EDT 2014 carol pearcy Smyrna, TN , US
114297 Thu Aug 28 18:42:06 EDT 2014 macyle candela East Berlin, PA , US
114296 Thu Aug 28 18:07:43 EDT 2014 Sarala Arunagiri El Paso, TX , US
114295 Thu Aug 28 17:51:28 EDT 2014 margie olvera palm bay, FL , US
114294 Thu Aug 28 17:51:09 EDT 2014 margie olvera palm bay, FL , US
114293 Thu Aug 28 17:17:31 EDT 2014 David Ramos Mishawaka, IN , US
114292 Thu Aug 28 16:50:48 EDT 2014 Barbara Franck Philadelphia, PA , US
114291 Thu Aug 28 16:23:08 EDT 2014 Nicolás Caballero Sevilla, ot , ES
114290 Thu Aug 28 16:21:32 EDT 2014 Barbara Poulsen Corvallis, OR , US
114289 Thu Aug 28 16:10:06 EDT 2014 Debbie Pezzillo Leeds, AL , US
114288 Thu Aug 28 16:03:32 EDT 2014 Paul Mayer Livingston, TX , US
114287 Thu Aug 28 15:45:34 EDT 2014 Glenn Eklund Oak Harbor, WA , US
114286 Thu Aug 28 01:17:09 EDT 2014 Laurie Sargent Livermore, CA , US
114285 Wed Aug 27 21:52:14 EDT 2014 Sheila Mandell Fort Lauderdale, FL , US
114284 Tue Aug 26 21:10:37 EDT 2014 Anonymous Magna, UT , US
114283 Tue Aug 26 11:13:29 EDT 2014 Bridget Bailey Stafford, VA , US
114282 Tue Aug 26 10:55:14 EDT 2014 cynthia west Gaithersburg, MD , US
114281 Tue Aug 26 10:29:33 EDT 2014 monique ponce Aulnay-sous-Bois, ot , FR
114280 Tue Aug 26 10:22:05 EDT 2014 Rebecca Banner Canton, OH , US
114279 Mon Aug 25 19:14:40 EDT 2014 Pamela Miller Tolar, TX , US
114278 Mon Aug 25 18:31:20 EDT 2014 Jose Avetikyan Moscow, ot , RU
114277 Mon Aug 25 18:31:20 EDT 2014 Jose Avetikyan Moscow, ot , RU
114276 Mon Aug 25 18:31:15 EDT 2014 Jose Avetikyan Moscow, ot , RU
114275 Mon Aug 25 17:34:44 EDT 2014 Alisa Adobajor Moscow, ot , RU
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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.