Science: Last Friday, the President's Council of Advisors on Science and Technology (PCAST) released a short report outlining various steps on climate change that President Barack Obama could take during his second term. Facing political gridlock on Capitol Hill and abroad, the PCAST scientists opted to highlight steps that PCAST member Daniel Schrag, a geochemist and energy expert at Harvard University, said the president "could push for and achieve." But some scientists say that Obama's advisers should...