Robert F. Kennedy Jr., who flies around on private planes so as to tell larger numbers of people how they must live their lives in order to save the planet, wrote a column last year on the lack of winter weather in Washington, D.C. "In Virginia, the weather also has changed dramatically. Recently arrived residents in the northern suburbs, accustomed to today's anemic winters, might find it astonishing to learn that there were once ski runs on Ballantrae Hill in McLean, with a rope tow and local ski club. Snow is so scarce today that most Virginia children probably...