Legislation to combat global warming by putting limits on greenhouse gas emissions appeared headed to defeat as Democrats and Republicans accused each other of manipulating Senate rules to impede it. Opponents of the bill, co-authored by Sen. John Warner of Virginia, are "trying to fritter away the time" that Senate leaders had set aside for debate, Democratic Sen. John Kerry charged. On Wednesday, Republicans forced Democrats to have the 492-page bill read aloud on the floor, taking up more than nine hours. Majority Leader Harry Reid then scheduled a showdown vote for this morning on a motion to limit additional...