by: John Marchese It's the last day of November, which means winter begins in three weeks. Yet the temperature on the Penn campus is nearing 70 degrees, and it's muggy. Walking to the offices of the Department of Earth and Environmental Science from a remote parking lot makes me sweaty. Global Warming. Driving here this morning, I heard a report on WHYY from National Public Radio that the International Ski Federation was canceling races because there's no snow in the Alps. Got to be Global Warmi...