The largest U.S. government agency – the Department of Defense, which is also the world’s largest single petroleum buyer – plans to forge ahead under the new administration with a decade-long effort to convert its fuel-hungry operations to renewable power. Why? In combat zones, green energy saves lives. The military’s zeal for renewable power has already had broad impacts on energy contractors, generating hundreds of millions of dollars in contracts for solar companies and helping to reduce fuel consumption. Trump’s Secretary of Defense, Jim Mattis, has long supported efforts to reduce troop dependence on petroleum.