Reuters: President Barack Obama’s budget accounts for revenues from an emissions trading system in 2012, White House spokesman Robert Gibbs said on Tuesday. “That’s true,” Gibbs said when asked whether a cap-and-trade system for greenhouse gases would be in place in time for revenues to be generated by 2012. The president, a Democrat, has said he wants the United States to take the lead in fighting climate change. During his presidential campaign Obama laid out plans for a …