New York Times: SHORTLY after winning re-election in November, President Obama promised assertive leadership on climate change and energy. In his State of the Union address in February, he vowed that if the assembled lawmakers failed to pass broad climate legislation, he would act unilaterally. And yet in the ensuing months, little more has been heard from the president or his cabinet on the matter. Agreement is broad on near-term executive actions to address climate change, including imposing strict caps on greenhouse-gas...