Reuters: Global warming legislation, already facing difficult odds in the Senate, looks even tougher to achieve because key lawmakers fear taking big steps on the environment when the economy is still shedding jobs. “I think standing in a deep economic hole is a difficult time to do big policy things that cause uncertainty,” said Democratic Senator Byron Dorgan. Dorgan, who is up for re-election next year, is one of a few dozen undecided senators who will be courted by Democratic …