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 114746 signatures
Number Date Name Location
114746 Mon Nov 24 12:58:16 EST 2014 Jessica Jean Posner Palmdale, CA , US
114745 Mon Nov 24 09:21:33 EST 2014 Melania Padilla Managua, ot , NI
114744 Sun Nov 23 18:23:45 EST 2014 Terri Vivyan Lansing, MI , US
114743 Sun Nov 23 07:12:47 EST 2014 Aysenur Çömlekci Manisa, Türkiye Cumhuriyeti, IA , CA
114742 Fri Nov 21 16:55:17 EST 2014 Debby Rising sacramento, CA , US
114741 Fri Nov 21 16:30:31 EST 2014 Carol Turton Swansea, MA , US
114740 Fri Nov 21 12:06:31 EST 2014 Anonymous Easton, PA , US
114739 Fri Nov 21 04:44:33 EST 2014 debbie mcqueen avon park, FL , US
114738 Thu Nov 20 17:15:50 EST 2014 Anonymous Cancun, ot , MX
114737 Thu Nov 20 16:30:00 EST 2014 ELLEN HOMSEY Hockessin, DE , US
114736 Wed Nov 19 16:42:40 EST 2014 Orva M Gullett Marion, OH , US
114735 Wed Nov 19 16:19:35 EST 2014 Debbie Neimark Chicago, IL , US
114734 Tue Nov 18 20:23:45 EST 2014 Anonymous Easton, PA , US
114733 Tue Nov 18 20:00:27 EST 2014 Anonymous Pittsburgh, PA , US
114732 Tue Nov 18 04:49:02 EST 2014 john greaves carson city , NV , US
114731 Tue Nov 18 00:23:25 EST 2014 Charlotte Vrancart Manalapan, NJ , US
114730 Mon Nov 17 00:11:14 EST 2014 Evan Roman San Diego, CA , US
114729 Sun Nov 16 17:04:35 EST 2014 Shirley Janus wailuku, HI , US
114728 Sun Nov 16 15:33:07 EST 2014 Karen H Eicholtz Wyckoff, NJ , US
114727 Fri Nov 14 23:14:01 EST 2014 Daniel Tham Singapore, ot , SG
114726 Fri Nov 14 22:12:57 EST 2014 E Romano si, NY , US
114725 Fri Nov 14 11:34:06 EST 2014 Myrna Crouch San Jose, CA , US
114724 Fri Nov 14 11:27:01 EST 2014 Debora Delgado Port Orange, FL , US
114723 Fri Nov 14 11:17:21 EST 2014 Anonymous Easton, PA , US
114722 Fri Nov 14 11:12:06 EST 2014 Gail Matwichuk Cultus Lake, BC , CA
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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.