New York Times: In proposing mandatory caps on the greenhouse gases linked to global warming and a system for auctioning permits to companies that emit them, President Obama is taking on a huge political and economic challenge. Business lobbies and many Republicans raised loud objections to the cap-and-trade program Mr. Obama proposed as part of his budget this week, saying the plan amounted to a gigantic and permanent tax on oil, electricity and manufactured goods, a shock they said the country …