Reuters: A new U.S. climate change bill could make its debut in the Senate soon in what likely would be the last big effort by Democrats to enact major environmental reforms this year. The House of Representatives narrowly passed a “cap and trade” bill in June to bring down U.S. emissions of carbon dioxide and other greenhouse gases blamed for global warming. But that bill, and a similar one approved in November by the Senate Environment and Public Works Committee, did not gain broad …