Bloomberg: Oil-sands producers will ask the Canadian government to delay new greenhouse-gas rules to give scientists time to figure out how to halt their emissions. “We’ll be talking to the government about their timeline for this,” Pierre Alvarez, president of the Canadian Association of Petroleum Producers, said yesterday in a telephone interview. “This is going to take a bunch of work.” Oil-mining operations in western Canada’s tar-soaked swamps and valleys that begin operations …