Pittsburgh Post-Gazette: Global warming skeptics reacted with glee to the recent record snowfalls from the Midwest to states farther south. But the intensity of such storms and other severe weather does not refute climate warnings. Rather, it reinforces the likelihood that the world's climate is changing because of human activity -- and not for the better. More than 21 inches of snow fell in Wichita, Kan., in February, breaking a century-old monthly record. More snow fell in one day in Amarillo, Texas, last month (19 inches)...