Reuters: President Barack Obama welcomed on Wednesday a Senate bill to cut carbon emissions and said he was “deeply committed” to passing it even as the White House played down chances that it would happen this year. Obama, whose international credibility on global warming is largely tied to the Senate’s effort, called the draft a major step forward in his plans to revamp U.S. energy policy. Representatives from about 190 nations are set to meet in Copenhagen in December to forge a U.N. …