Washington Post: The Obama administration might agree to postpone auctioning off 100 percent of emissions allowances under a cap-and-trade system to limit greenhouse gas pollution, White House science adviser John P. Holdren said today, a move that would please electricity providers and manufacturers but could anger environmentalists. In one of his first interviews since being confirmed March 20 as director of the White House Office of Science and Technology Policy, Holdren said a group of …