WASHINGTON, Jan 10 (Reuters) - The Bush administration on Friday gave the green light to more coalbed methane drilling in Wyoming's Powder River Basin, saying its studies showed that the process of squeezing natural gas out of coal deposits would not harm the environment. In two environmental impact studies that support President George W. Bush's plan to boost energy exploration in the west, the Bureau of Land Management said impact to water, soil and wildlife in the region would be "minor." The BLM, in an about-face from its earlier draft, proposed storing salty water used to extract natural gas in...