In the first speech of his "whistle-stop" tour to Washington, Barack Obama talked global warming to a crowd of shivering Philadelphians who braved 18 degree (sub 10 degree wind-chill) temperatures on their journey to the 30th Street Train Station. It's hard to believe that, given the arctic-like temperatures the northeast has suffered through this winter, the president-elect didn't instruct his writers to reword this passage from his "historic" speech: [my emphasis] "Only a handful of times in our history has a generation been confronted with challenges so vast. An economy that is