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 113632 signatures
Number Date Name Location
113632 Wed Jul 23 16:44:55 EDT 2014 Velvet Jacobs Washington, DC , US
113631 Wed Jul 23 14:06:52 EDT 2014 Carole Matthews Glendale, PA , US
113630 Wed Jul 23 11:37:12 EDT 2014 Adrian Freeman Toronto, ON , CA
113629 Tue Jul 22 18:52:57 EDT 2014 Amber Still Bellingham, WA , US
113628 Tue Jul 22 16:16:13 EDT 2014 darlene reynolds katy, TX , US
113627 Tue Jul 22 11:20:22 EDT 2014 Anonymous Easton, PA , US
113626 Tue Jul 22 03:16:52 EDT 2014 Angie Hris Athens, NY , GR
113625 Tue Jul 22 03:00:01 EDT 2014 Tanya Krusko Miami, FL , US
113624 Mon Jul 21 20:33:04 EDT 2014 Noelle Pellowski Columbus, OH , US
113623 Mon Jul 21 19:20:38 EDT 2014 Sheryl Greenhouse Ontario, CA , US
113622 Mon Jul 21 17:26:04 EDT 2014 Nuria Vergara Torredembarra, ot , ES
113621 Mon Jul 21 13:52:53 EDT 2014 Dani Muscardelli Johnstown, PA , US
113620 Mon Jul 21 12:08:47 EDT 2014 Yvette Etteldorf Little Rock, AR , US
113619 Mon Jul 21 10:48:06 EDT 2014 Ellen Clark Fort Wayne, IN , US
113618 Mon Jul 21 07:22:11 EDT 2014 Melanie Fritz Weingarten, ot , DE
113617 Mon Jul 21 05:27:07 EDT 2014 alunni ilaria perugia, ot , IT
113616 Mon Jul 21 00:31:11 EDT 2014 Kalita Todd Grass Valley, CA , US
113615 Sun Jul 20 18:23:39 EDT 2014 Michael Schaper Conyers, GA , US
113614 Sun Jul 20 15:12:11 EDT 2014 Patricia Diaz montreal , QC , CA
113613 Sun Jul 20 15:12:00 EDT 2014 carmen Rico Toronto, ON , CA
113612 Sun Jul 20 11:48:28 EDT 2014 desiree johnson middleboro, MA , US
113611 Sun Jul 20 10:13:46 EDT 2014 Paul RW Anthony Bonners Ferry, ID , US
113610 Sun Jul 20 01:55:30 EDT 2014 suzanne aagaard svendborg, ot , DK
113609 Sun Jul 20 00:44:26 EDT 2014 Matias Veglio Buenos Aires, ot , AR
113608 Sat Jul 19 23:16:25 EDT 2014 Nerma Valentic South Burlington, VT , 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.