Republican John McCain pledged to take the lead in combating global climate change if elected president in a speech that set him apart from the policies of President George W. Bush.In remarks he prepared to give at a wind technology firm in Portland, Oregon, on Monday, the Arizona senator said he would seek international accords to reduce greenhouse gas emissions, and would offer an incentive system to make businesses in the United States cleaner. "The facts of global warming demand our urgent attention, especially in Washington," McCain said in remarks he planned to give at the Vestas Wind Technology plant. "Good stewardship, prudence, and simple common sense demand that we act to meet the challenge, and act quickly," he added.