Reuters: Canadian Prime Minister Stephen Harper, whose government is often criticized for dragging its feet on global warming, will attend U.N. talks next month in Copenhagen designed to find a successor to the Kyoto climate change protocol. Harper spokesman Dimitri Soudas said on Thursday that no date for the prime minister’s visit had yet been set. U.S. President Barack Obama said on Wednesday he would be in Copenhagen for the start of the meeting on December 9. “We will be attending …