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 111986 signatures
Number Date Name Location
111986 Thu Apr 24 19:45:33 EDT 2014 Jolanta Wright Orlando, FL , US
111985 Thu Apr 24 19:12:54 EDT 2014 Brenda Smith Mcminnville, TN , US
111984 Thu Apr 24 19:02:07 EDT 2014 Jessie Bowen Wellesley, MA , US
111983 Thu Apr 24 19:00:29 EDT 2014 Anonymous Boulder, CO , US
111982 Thu Apr 24 18:58:20 EDT 2014 Herman Diaz Brighton, MA , US
111981 Thu Apr 24 18:58:19 EDT 2014 Sheri Curtis San Antonio, TX , US
111980 Thu Apr 24 18:54:19 EDT 2014 Joan Kolessar Nazareth, PA , US
111979 Thu Apr 24 18:47:20 EDT 2014 MIKE FOGT CALEDON EAST, ON , CA
111978 Thu Apr 24 18:19:03 EDT 2014 Linda Fay Sampson Eugene, OR , US
111977 Thu Apr 24 18:12:22 EDT 2014 Belinda Scott Gardner, MA , US
111976 Thu Apr 24 18:11:28 EDT 2014 Kim Newhart New Providence, RI , US
111975 Thu Apr 24 18:09:59 EDT 2014 Jordanna Newman Virginia , MN , US
111974 Thu Apr 24 17:42:14 EDT 2014 sheri cutright st augustine, FL , US
111973 Thu Apr 24 17:41:49 EDT 2014 DivyaDarshan Gurrala VIJAYAWADA, IA , US
111972 Thu Apr 24 17:27:53 EDT 2014 Margery Schiff White Plains, NY , US
111971 Thu Apr 24 17:24:40 EDT 2014 Jamie Greer West Orange, NJ , US
111970 Thu Apr 24 17:09:15 EDT 2014 tina fritts owatonna, MN , US
111969 Thu Apr 24 17:04:37 EDT 2014 Katrin Winterer Winchester, MA , US
111968 Thu Apr 24 16:59:11 EDT 2014 Mignonne Walker La Canada Flintridge, CA , US
111967 Thu Apr 24 16:58:59 EDT 2014 Andrea Gibson Torrance, CA , US
111966 Thu Apr 24 16:57:46 EDT 2014 Joanne Lowery b, MI , US
111965 Thu Apr 24 16:44:38 EDT 2014 Patrick Tubilleja Raleigh, NC , US
111964 Thu Apr 24 16:18:21 EDT 2014 Adam Burns New York, NY , US
111963 Thu Apr 24 16:15:59 EDT 2014 Bonita Staas Orangeville, IL , US
111962 Thu Apr 24 15:43:19 EDT 2014 John Landers Oneida, IL , 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.