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 116517 signatures
Number Date Name Location
116517 Sun Feb 07 05:10:25 EST 2016 Wayne Langley Texas, TX , US
116516 Sun Feb 07 00:50:22 EST 2016 Stephen Spieckerman Waukesha, WI , US
116515 Sat Feb 06 03:18:58 EST 2016 Benjamin Wagner Port Orchard, WA , US
116514 Fri Feb 05 13:08:55 EST 2016 Carol Papworth WA, WA , US
116513 Fri Feb 05 02:24:58 EST 2016 Gerald Fisher Hillsboro, OR , US
116512 Thu Feb 04 22:57:52 EST 2016 Maria Garcia Guadalajara, ot , MX
116511 Thu Feb 04 15:22:07 EST 2016 Gloria Stacholy Coral Gables, FL , US
116510 Thu Feb 04 14:59:59 EST 2016 Sarah Sivro Geneva , ot , CH
116509 Thu Feb 04 13:48:18 EST 2016 Anonymous Sussex, ot , GB
116508 Wed Feb 03 14:34:45 EST 2016 emme g ch, CA , US
116507 Tue Feb 02 22:16:05 EST 2016 Judith Haglund Sarasota, FL , US
116506 Tue Feb 02 18:34:49 EST 2016 Tina daCruz Northampton, ot , GB
116505 Tue Feb 02 06:18:18 EST 2016 Amanda Martines Wellington, NV , US
116504 Sun Jan 31 17:02:43 EST 2016 Brian K Sutton Louisville, KY , US
116503 Sun Jan 31 11:01:58 EST 2016 mary ann millay mpls, MN , US
116502 Sat Jan 30 22:53:11 EST 2016 George Sherman new york, NY , US
116501 Sat Jan 30 19:10:44 EST 2016 Nicole Loh Singapore, ot , SG
116500 Sat Jan 30 13:05:43 EST 2016 Macyle Candela East Berlin , PA , US
116499 Sat Jan 30 13:00:37 EST 2016 Alex Par Fresno, CA , US
116498 Fri Jan 29 23:08:19 EST 2016 Chris McCarron Oakland, CA , US
116497 Fri Jan 29 16:12:51 EST 2016 lynn harrigan marina, CA , US
116496 Fri Jan 29 15:01:14 EST 2016 Gerry GAuden Long Beach, CA , US
116495 Fri Jan 29 12:58:19 EST 2016 Anonymous east, PA , US
116494 Fri Jan 29 12:35:15 EST 2016 Cybele Knowles Tucson, AZ , US
116493 Thu Jan 28 21:01:55 EST 2016 William Lewis CO, CO , 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.