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 111861 signatures
Number Date Name Location
111861 Fri Apr 18 01:27:18 EDT 2014 Kathryn Schneider Ann Arbor, MI , US
111860 Fri Apr 18 01:21:44 EDT 2014 Jennifer Johnson Snohomish, WA , US
111859 Fri Apr 18 01:21:44 EDT 2014 Jennifer Johnson Snohomish, WA , US
111858 Fri Apr 18 00:59:32 EDT 2014 Carol Dubovick Concord, CA , US
111857 Fri Apr 18 00:54:53 EDT 2014 P Hinrichs Highlands Ranch, CO , US
111856 Fri Apr 18 00:45:10 EDT 2014 Susie Hurst Elizabethtown, KY , US
111855 Fri Apr 18 00:25:59 EDT 2014 robert manchester pine city, NY , US
111854 Thu Apr 17 23:56:48 EDT 2014 Reynolds Hofheins Oakleigh East, ot , AU
111853 Thu Apr 17 23:32:44 EDT 2014 Margaret Bonn Buffalo, NY , US
111852 Thu Apr 17 23:27:56 EDT 2014 nelson myers harrisburg, PA , US
111851 Thu Apr 17 23:27:55 EDT 2014 nelson myers harrisburg, PA , US
111850 Thu Apr 17 22:49:43 EDT 2014 Richard Engle Winnetka, CA , US
111849 Thu Apr 17 22:33:43 EDT 2014 mauricio carvajal Santiago, ot , CL
111848 Thu Apr 17 22:15:55 EDT 2014 Lina Chen Brooklyn, NY , US
111847 Thu Apr 17 22:05:32 EDT 2014 Anonymous miami, FL , US
111846 Thu Apr 17 22:02:43 EDT 2014 Sara Wersinger Buda, TX , US
111845 Thu Apr 17 22:01:12 EDT 2014 Anonymous Warsaw, ot , PL
111844 Thu Apr 17 21:43:40 EDT 2014 Shana Cobin Foster, RI , US
111843 Thu Apr 17 21:28:46 EDT 2014 wendy niemeyer waterloo, IA , US
111842 Thu Apr 17 21:26:06 EDT 2014 Canan Tzelil Beverly Hills, CA , US
111841 Thu Apr 17 21:05:31 EDT 2014 Christiaan Petersen St Petersburg, FL , US
111840 Thu Apr 17 20:48:18 EDT 2014 Stacey Clark Norfolk, VA , US
111839 Thu Apr 17 20:45:11 EDT 2014 susan lewis ypsilanti, MI , US
111838 Thu Apr 17 20:43:26 EDT 2014 dave delson boca raton, FL , US
111837 Thu Apr 17 20:37:11 EDT 2014 Tiffany Hayden Phoenix, AZ , 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.