"The United States pledged Thursday to cut its greenhouse gas emissions by 17 percent by 2020 from 2005 levels under an international climate agreement, though it made its commitment contingent on passing legislation at home.
The Obama administration submitted its much-anticipated reduction target to the United Nations Framework Convention on Climate Change Secretariat under the Copenhagen Accord, a non-binding deal brokered by the United States last month at the U.N.-sponsored climate talks. Under the deal President Obama helped secure in Copenhagen, major emitters of greenhouse gases are expected to "inscribe" their reduction targets by Jan. 31." 
Juliet Eilperin reports for Washington Post January 29, 2010.