The Environmental Protection Agency officially declares greenhouse gases a threat to public health and welfare. How the decision could affect the U.S. economy and the Obama administration’s position at the Copenhagen climate summit.


  • Jeff Holmstead Former assistant administrator for air and radiation at the Environmental Protection Agency (2001-05); now heads the environmental strategy section at Bracewell & Giuliani LLP.
  • Margaret Kriz Hobson Energy and environment correspondent, National Journal
  • Eileen Claussen President, Pew Center on Global Climate Change and Strategies for the Global Environment
  • Jeffrey Ball Environment editor and columnist, Wall Street Journal His WSJ column "Power Shift" appears every other Friday.

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