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 114324 signatures
Number Date Name Location
114324 Mon Sep 01 18:24:31 EDT 2014 Liberty Brigner Columbus, OH , US
114323 Mon Sep 01 16:09:47 EDT 2014 Matthew Hartlieb Mesa, AZ , US
114322 Mon Sep 01 16:00:37 EDT 2014 Lara Linnemeier Düsseldorf, ot , DE
114321 Sun Aug 31 19:59:55 EDT 2014 Laura Freeney Loranger, LA , US
114320 Sun Aug 31 15:33:49 EDT 2014 Thomas Piper Laurel, MD , US
114319 Sun Aug 31 07:38:15 EDT 2014 Eric Carlson, PhD Ventura, CA , US
114318 Sun Aug 31 07:00:08 EDT 2014 liron solomon holon, ot , IL
114317 Sun Aug 31 02:47:39 EDT 2014 Dustin Cloyes Columbiaville, MI , US
114316 Sun Aug 31 01:30:58 EDT 2014 Elizabeth Boggess Hammond, IN , US
114315 Sat Aug 30 18:27:03 EDT 2014 Thomas Kuntz Portsmouth, VA , US
114314 Sat Aug 30 16:22:52 EDT 2014 Nancy Hauer White Bear Lake, MN , US
114313 Sat Aug 30 07:53:32 EDT 2014 Martin Haunhorst Bonn, ot , DE
114312 Sat Aug 30 05:17:50 EDT 2014 Anonymous Denville, RI , US
114311 Fri Aug 29 23:39:16 EDT 2014 Tracey McManus Hazelbrook, ot , AU
114310 Fri Aug 29 23:17:53 EDT 2014 Jin Nothmann Owings mills, MD , US
114309 Fri Aug 29 19:11:28 EDT 2014 Lily Sandoval Pasadena , CA , US
114308 Fri Aug 29 12:15:06 EDT 2014 Anonymous Hamburg, ot , DE
114307 Fri Aug 29 11:25:48 EDT 2014 Amanda Braden Bayonne, NJ , US
114306 Fri Aug 29 11:10:53 EDT 2014 Anonymous Easton, PA , US
114305 Fri Aug 29 08:07:55 EDT 2014 Gail MacDonald Montevideo, ot , UY
114304 Fri Aug 29 04:10:08 EDT 2014 Daniel Tham Singapore, ot , SG
114303 Fri Aug 29 03:39:20 EDT 2014 Iovanovici Camelia Timisoara, ot , RO
114302 Fri Aug 29 00:28:00 EDT 2014 Anonymous Roodhouse, IL , US
114301 Fri Aug 29 00:16:37 EDT 2014 debbie cat west monroe, NY , US
114300 Thu Aug 28 23:10:29 EDT 2014 Sheila Mandell Fort Lauderdale, FL , 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.