A year ago, it seemed possible -- likely, even -- that President Barack Obama would sweep into the international negotiations on climate change at Copenhagen and make serious progress on the tangle of issues at stake. The reality was quite different. This year, the expectations for the United Nations Climate Conference in Cancun are less exuberant.

In his first State of the Union address, President Barack Obama touched on climate issues only briefly. He called on the Senate to pass a climate bill, but did not give Congress a deadline or promise to veto weak legislation. Nor did he mention the Copenhagen climate conference, where international negotiators struggled to produce an agreement on limiting global carbon emissions.