New York Times: Droves of student activists are arriving in Washington for a weekend of rallies, panel discussions, concerts and lobbying for federal action on global warming. More than 10,000 are registered to attend Power Shift 2009, which has two full days of activities at the Washington Convention Center and culminates Monday with a rally on the Capitol’s West Lawn and a day of calling on lawmakers. Meetings scheduled at more than 360 congressional offices could draw as many as 600 …