Reuters: The U.S. military has a history of fostering change, from racial integration to development of the Internet. Now, Pentagon officials say their green energy efforts will help America fight global warming. By size alone, the Defense Department can make waves. It accounts for 1.5 percent of U.S. energy consumption. The military has set a goal that 25 percent of its energy should come from renewable sources by 2025 and aims to create machines and methods to help Main Street America …