Reuters: The U.S. military, the government’s largest fuel buyer, is leading the fight against climate change by investing in the “Great Green Fleet” and other ways of cutting dependence on oil and coal, according to a Pew Charitable Trusts report released on Tuesday. “They’re not having long and protracted debates about whether or not we can afford it … they are marching” into investments in everything from electric vehicles to forming strike groups that run on alternative fuels, said …