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 114916 signatures
Number Date Name Location
114916 Wed Jan 28 15:33:10 EST 2015 Dennis Landi Long Beach, CA , US
114915 Tue Jan 27 22:50:17 EST 2015 Anonymous Portland, OR , US
114914 Mon Jan 26 14:20:33 EST 2015 Susan Warner El Cerrito, CA , US
114913 Mon Jan 26 12:22:39 EST 2015 Birgit Dashi Forchheim, ot , DE
114912 Sat Jan 24 17:14:05 EST 2015 Anonymous Whitehall, PA , US
114911 Sat Jan 24 14:09:49 EST 2015 Natasha Haynes Bristol, ot , GB
114910 Sat Jan 24 10:39:53 EST 2015 Josette Martin Palm Coast , FL , US
114909 Fri Jan 23 21:36:31 EST 2015 Christine Cranston Seattle, WA , US
114908 Fri Jan 23 15:04:53 EST 2015 William Mullen Wheeler, OR , US
114907 Fri Jan 23 11:35:15 EST 2015 Orva M Gullett Marion, OH , US
114906 Thu Jan 22 19:19:24 EST 2015 karen howard blaine, WA , US
114905 Thu Jan 22 18:16:11 EST 2015 Anonymous Fairview, NC , US
114904 Thu Jan 22 16:27:17 EST 2015 orchid ra southport, NC , US
114903 Thu Jan 22 15:51:32 EST 2015 kyle Rader Nashua, NH , US
114902 Tue Jan 20 19:50:04 EST 2015 Nicole Matteo Brooklyn, NY , US
114901 Tue Jan 20 17:50:46 EST 2015 rocco frangione ottawa, CA , US
114900 Tue Jan 20 11:49:24 EST 2015 Josseline Husted Monterey, CA , US
114899 Sat Jan 17 21:52:54 EST 2015 Karen Janda Aurora, CO , US
114898 Sat Jan 17 15:44:27 EST 2015 Cristina Kennington Chillicothe, IL , US
114897 Fri Jan 16 13:46:36 EST 2015 Carol Gignoux Jamaica Plain, MA , US
114896 Fri Jan 16 11:21:36 EST 2015 Anonymous Easton, PA , US
114895 Fri Jan 16 08:52:16 EST 2015 Daniel Tham Singapore, ot , SG
114894 Thu Jan 15 21:55:12 EST 2015 Mandy Hahn Bloomfield, NY , US
114893 Thu Jan 15 15:18:08 EST 2015 Dana Earnest Pascagoula, MS , US
114892 Thu Jan 15 14:46:34 EST 2015 Jackie Martinez Belleville, NJ , 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.