They say this reflects Mr. Obama's broader commitment to reduce emissions by 83 percent by 2050 in interim steps as follows:
• 30 percent below 2005 levels in 2025
• 42 percent below 2005 levels in 2030
These numbers are similar to the bills pending in both House and Senate.
White House climate change adviser Carol Browner says the Congressional Budget Office has scored the economic impact of these reductions at $173 a year per family of four in 2020.
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