Center for     Biological     Diversity   

People's Petition to Cap Carbon Dioxide Pollution at 350 Parts Per Million


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 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.

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.

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
Optional Member Code

1-25 of 110865 signatures
Number Date Name
110865 Tue May 23 19:55:24 EDT 2017 JoAnn Sheperd
110864 Sun May 21 11:35:43 EDT 2017 Graham Douglas
110863 Fri May 19 17:05:08 EDT 2017 william bedinghaus
110862 Fri May 19 16:59:31 EDT 2017 william bedinghaus
110861 Fri May 19 06:42:57 EDT 2017 margaret roy
110860 Thu May 18 16:11:40 EDT 2017 Julian Corley
110859 Thu May 18 12:25:25 EDT 2017 Anonymous
110858 Thu May 18 07:49:30 EDT 2017 Lynette Tudorache
110857 Wed May 17 21:07:21 EDT 2017 sirena green
110856 Wed May 17 18:40:51 EDT 2017 Cheri Albin
110855 Wed May 17 13:16:10 EDT 2017 Bonnie Steiger
110854 Tue May 16 18:30:56 EDT 2017 Pippa Scott
110853 Tue May 16 18:30:47 EDT 2017 Pippa Scott
110852 Tue May 16 18:30:23 EDT 2017 Pippa Scott
110851 Tue May 16 18:29:59 EDT 2017 Pippa Scott
110850 Tue May 16 17:15:41 EDT 2017 Deanna Horton
110849 Tue May 16 16:38:54 EDT 2017 Javier Beraza
110848 Tue May 16 16:38:29 EDT 2017 Lennart Blomqvist
110847 Tue May 16 16:34:06 EDT 2017 T J Thompson
110846 Tue May 16 15:46:24 EDT 2017 Susan Wyoral
110845 Tue May 16 14:48:57 EDT 2017 Cinzia Caporali
110844 Tue May 16 14:24:36 EDT 2017 Connie Williams
110843 Tue May 16 14:23:32 EDT 2017 Anonymous
110842 Tue May 16 14:12:46 EDT 2017 Jim Loveland
110841 Tue May 16 13:58:49 EDT 2017 GILBERT AND SONYA LEYVA
Next ->

Please take action by Jan. 15, 2018.

Photo of smokestack courtesy NASA.

If you have cookies enabled in your Web browser, our action pages will remember your address information for 30 days.