Washington Post: The weather in Washington has been like a roller coaster this January. Yes, there has been a deep freeze this week, but it was the sudden warmth earlier in the month that was truly alarming. Flocks of birds -- robins, wrens, cardinals and even blue jays -- swarmed bushes with berries, eating as much as they could. Runners and bikers wore shorts and T-shirts. People worked in their gardens as if it were spring.
The signs of global warming are becoming more obvious and more frequent. A glut of extreme...