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 114425 signatures
Number Date Name Location
114425 Mon Sep 15 12:37:29 EDT 2014 Bonnie Svec Rockville, MD , US
114424 Sun Sep 14 23:13:13 EDT 2014 Georgii Billiris Atlanta, GA , US
114423 Sun Sep 14 12:49:38 EDT 2014 Lisa Shea Springfield, MA , US
114422 Sat Sep 13 13:18:10 EDT 2014 Carol Papworth Everett, WA , US
114421 Sat Sep 13 11:06:20 EDT 2014 Nerma Valentic South Burlington, VT , US
114420 Sat Sep 13 02:21:38 EDT 2014 Paul Naylor Eugene, OR , US
114419 Fri Sep 12 22:13:00 EDT 2014 dan lusk grand rapids, MI , US
114418 Fri Sep 12 21:16:15 EDT 2014 Martin Kornbluh Port Washington, NY , US
114417 Fri Sep 12 19:24:15 EDT 2014 Todd Williams Springfield, MO , US
114416 Fri Sep 12 19:23:17 EDT 2014 Todd Williams Springfield, MO , US
114415 Fri Sep 12 17:58:26 EDT 2014 aniza cordova Long Beach, CA , US
114414 Fri Sep 12 17:27:30 EDT 2014 Jose Avetikyan Moscow, ot , RU
114413 Fri Sep 12 17:27:24 EDT 2014 Jose Avetikyan Moscow, ot , RU
114412 Fri Sep 12 16:34:05 EDT 2014 KATIE PARKER CONWAY, AR , US
114411 Fri Sep 12 14:41:55 EDT 2014 CHRIS NELSON NAPERVILLE, IL , US
114410 Fri Sep 12 14:34:34 EDT 2014 geneva adams san bernardino, CA , US
114409 Fri Sep 12 14:26:09 EDT 2014 wo orlowsky east of, PA , US
114408 Fri Sep 12 13:10:52 EDT 2014 Shelley Brown Los Angeles, CA , US
114407 Fri Sep 12 12:32:15 EDT 2014 Gail MacDonald Montevideo, ot , UY
114406 Fri Sep 12 10:38:47 EDT 2014 Anonymous easton, PA , US
114405 Fri Sep 12 10:20:56 EDT 2014 Jodi Rodar Springfield, MA , US
114404 Fri Sep 12 08:58:45 EDT 2014 Lorena Balcells Buenos Aires, ot , AR
114403 Fri Sep 12 08:05:18 EDT 2014 K.V. Adamski Nanuet, NY , US
114402 Fri Sep 12 06:46:21 EDT 2014 Cathy Loewenstein Babylon, NY , US
114401 Fri Sep 12 05:29:19 EDT 2014 Daniel Tham Singaporse, SK , SG
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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.