McCain is a newcomer to many of the positions outlined in his energy and climate platform. He proposes expanding the supply of oil by drilling off the continental shelf, but he also supports energy efficiency and alternative and clean fuels, both to wean the country from foreign oil and to reduce emissions that cause global warming. His proposed cap-and-trade system would reduce greenhouse gas emissions by 60 percent from 1990 levels in 2050. Though he would largely leave it to the market to develop conservation and renewable fuel technologies, McCain would offer large government subsidies for nuclear and clean coal power. He would subsidize building 45 new nuclear reactors by 2030, and would also devote $30 billion over 15 years to spur development in clean coal.