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    Democrats

  • Hillary Clinton

    Would agree to limits on U.S. carbon emissions, tougher energy and car efficiency standards and more funding for green research.
  • Barack Obama

    Wants an 80% cut in U.S. greenhouse gas emissions by 2050 and would invest $150 billion over 10 years to clean energy.
  • Mike Gravel

    Supports a carbon tax and changing the tax structure to give incentive for Americans to conserve.

    Former Democratic Candidates

  • John Edwards

    Would seek an international climate change treaty, repeal oil company subsidies and cut greenhouse gas emissions by 80% by 2050.
  • Dennis Kucinich

    U.S. should lead the effort to work with other countries to reduce greenhouse gases.

    Republicans

  • John McCain

    Supports a global coalition, including China and India, to reduce greenhouse gas emissions.
  • Ron Paul

    Would enforce private property rights to prohibit anyone from polluting.

    Former Republican Candidates

  • Rudy Giuliani

    Wants to pursue energy independence and a government-led effort to develop green technology.
  • Mike Huckabee

    Advocates energy independence by the end of his second term in office.
  • Duncan Hunter

    Emphasizes energy independence.
  • Mitt Romney

    Supports a global coalition for the reduction of greenhouse gas emissions but only if China and India join.
  • Fred Thompson

    Isn't convinced as to how or why climate change is occurring. Wants U.S. to end reliance on foreign oil.