[h=1]Obama to climate change key issue of final years in office as he seeks to secure his legacy[/h]
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- Obama set an ambitious new target for cutting future U.S. emissions as part of a landmark deal in which China will also rein in pollution
- White House aides say the issue has become even more attractive after the election because it's one where Obama has considerable leverage to act without Congress
- Obama said his administration shaped its new goal to cut emissions at least 26 percent by 2025 based on existing legal authorities
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