United Press International: As Congress and the new administration try to tackle climate change and dependence on foreign oil, more than a half-million Americans are weaning their homes from fossil fuels, opting to buy clean, homegrown electricity. Currently 850 U.S. utilities, or 25 percent of utility companies nationwide, offer their customers the option of buying power generated from renewable sources. The amount of energy sold in green pricing programs has more than doubled since 2004, and the number of …