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 111942 signatures
Number Date Name Location
111942 Wed Apr 23 05:23:23 EDT 2014 veronika radosova trencin, ot , SK
111941 Wed Apr 23 03:59:19 EDT 2014 Daniel Girling Newbury, ot , GB
111940 Tue Apr 22 23:07:59 EDT 2014 KIMBERLY ROSS Toronto, ON , CA
111939 Tue Apr 22 22:29:54 EDT 2014 Brittani Killion-Mottola Austin, TX , US
111938 Tue Apr 22 17:42:10 EDT 2014 brigitte ballouard villefranche sur mer, ot , FR
111937 Tue Apr 22 15:46:26 EDT 2014 nelson myers harrisburg, PA , US
111936 Tue Apr 22 10:56:11 EDT 2014 Natasha Atilio San Juan, PR , PR
111935 Tue Apr 22 09:23:15 EDT 2014 laura gagliotti augusta, DC , IT
111934 Tue Apr 22 07:16:20 EDT 2014 andrea wells abingdon, VA , US
111933 Tue Apr 22 07:03:32 EDT 2014 liron solomon holon, ot , IL
111932 Tue Apr 22 05:07:34 EDT 2014 Zohal Khan Bethlehem, PA , US
111931 Mon Apr 21 21:49:53 EDT 2014 Sheila Mandell Fort Lauderdale, FL , US
111930 Mon Apr 21 21:26:49 EDT 2014 Judith Fine-Sarchielli Topanga, CA , US
111929 Mon Apr 21 20:37:12 EDT 2014 KAREN PEPE HAWTHORNE, NJ , US
111928 Mon Apr 21 20:35:20 EDT 2014 Mary Mann Cumming, GA , US
111927 Mon Apr 21 16:26:35 EDT 2014 Katelyn Wallach Purchase, NY , US
111926 Mon Apr 21 15:58:46 EDT 2014 Anonymous naples, FL , US
111925 Mon Apr 21 14:51:24 EDT 2014 Debra Young Hooksett, NH , US
111924 Mon Apr 21 13:33:27 EDT 2014 Anonymous Warren, MI , US
111923 Mon Apr 21 13:32:36 EDT 2014 Marta Hawkins Richmond Hill, GA , US
111922 Mon Apr 21 10:34:53 EDT 2014 Maria Baena Miami, FL , US
111921 Mon Apr 21 06:07:46 EDT 2014 DOLORES MORENO MADRID, NC , ES
111920 Mon Apr 21 06:07:21 EDT 2014 DOLORES MORENO MADRID, NC , ES
111919 Sun Apr 20 23:58:12 EDT 2014 Frank Adamick Astoria, NY , US
111918 Sun Apr 20 23:31:05 EDT 2014 Cassandra Fazio Cotati, CA , 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.