In the Toolkit --


  • Guide to the Toolkit
  • Leagues in Action
  • I. Choosing a Role for Your League

    II. Grassroots Action Priorities

  • Climate Action
  • Price on Carbon
  • Our Children's Trust
  • Energy Efficient Buildings
  • Renewable Energy
  • Adapting to Climate Change
  • III. Basics of Climate Change

    IV. Engaging Individuals

  • Communicating About Climate Change
  • Preparing for a Meeting on Climate Change
  • Engaging Groups in Your Community
  • V. Promoting Public Policy

  • Community Action Models
  • Organizing For Community Action
  • Tips for Building Grassroots Support
  • League Action on Climate Change
  • International Action
  • VI. Resources

    EPA's Endangerment Finding

    In its April 2007 decision (Massachusetts v. EPA), the U.S. Supreme Court found that greenhouse gases (GHGs) are air pollutants covered by the Clean Air Act (CAA). The Court held that the EPA must determine whether or not GHG emissions from motor vehicles cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare, or whether the science is too uncertain to make a reasoned decision.

    In response, the EPA conducted a thorough examination of the scientific evidence of the causes and impacts of current and future climate change, as well as other effects of GHGs, and concluded that the science supported a finding that concentrations of GHGs do threaten both the public health and public welfare and that emissions of GHG pollutants from motor vehicles contribute to that threat.

    In April 2009, the EPA Administrator issued two proposed findings --

    A 60-day public comment period followed publication of the proposed findings. On December 7, 2009, after careful consideration of the public comments, the EPA Administrator signed the final Endangerment and Cause or Contribute findings for GHGs under Section 202(a) of the CAA.

    This action did not of itself impose any requirements on industry or other entities, but it did pave the way for the EPA to finalize its proposed GHG emission standards for light-duty vehicles. The EPA had proposed these in conjunction with the Department of Transportation's proposed Corporate Average Fuel Economy (CAFE) standards earlier in the year.


    From the EPA --