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 113752 signatures
Number Date Name Location
113752 Mon Jul 28 05:07:25 EDT 2014 suzanne aagaard svendborg, ot , DK
113751 Mon Jul 28 03:37:12 EDT 2014 MARIA PIA SCOTTO DI FREGA ROMA, ot , IT
113750 Mon Jul 28 02:17:53 EDT 2014 Martin Haunhorst Bonn, ot , DE
113749 Sun Jul 27 23:05:50 EDT 2014 Anonymous buffalo, NY , US
113748 Sun Jul 27 22:02:18 EDT 2014 Taylor Barton toledo, OH , US
113747 Sun Jul 27 19:56:35 EDT 2014 Tina Zeeberg Portland, OR , US
113746 Sun Jul 27 18:24:44 EDT 2014 Raymond Arent Severna Park, MD , US
113745 Sun Jul 27 11:01:42 EDT 2014 Alina Bertol Fuengirola, ot , ES
113744 Sun Jul 27 10:14:19 EDT 2014 Joanne Lowery b, MI , US
113743 Sun Jul 27 04:52:00 EDT 2014 ????? ??????? ??????????, FL , RU
113742 Sun Jul 27 04:40:25 EDT 2014 jet asha sydney, ot , AU
113741 Sun Jul 27 00:47:08 EDT 2014 Donna Deese Carrollton, TX , US
113740 Sat Jul 26 21:30:27 EDT 2014 Moya sanders south lake tahoe, CA , US
113739 Sat Jul 26 17:20:17 EDT 2014 betty almand avondale est., GA , US
113738 Sat Jul 26 16:57:13 EDT 2014 Jose Avetikyan Moscow, ot , RU
113737 Sat Jul 26 16:56:45 EDT 2014 Jose Avetikyan Moscow, ot , RU
113736 Sat Jul 26 16:51:45 EDT 2014 Amanda Esposito Reno, NV , US
113735 Sat Jul 26 15:33:20 EDT 2014 Alisa Adobajor Moscow, ot , RU
113734 Sat Jul 26 15:33:15 EDT 2014 Alisa Adobajor Moscow, ot , RU
113733 Sat Jul 26 12:08:15 EDT 2014 Amanda Mikalson Farmington, WA , US
113732 Sat Jul 26 10:41:06 EDT 2014 Pamela Ellison Kirkwood, NY , US
113731 Sat Jul 26 10:30:12 EDT 2014 colleen nersesian weaverville, NC , US
113730 Sat Jul 26 03:26:51 EDT 2014 carmen stevenson london, ot , GB
113729 Sat Jul 26 01:52:43 EDT 2014 Maria R Gomez Des Plaines, IL , US
113728 Fri Jul 25 22:26:13 EDT 2014 walker hibben newport beach, CA , 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.