"President Barack Obama signed an executive order on Thursday committing the federal government to cutting its own emissions 40 percent by 2025 and pledging to increase the amount of renewable energy used by federal agencies to 30 percent. The executive order builds on a previous administration directive to cut emissions from federal agencies 28 percent by 2020, compared with 2008 levels. 'We are well on our way to meet that goal,' Brian Deese, senior adviser to the president, said in a call with reporters Thursday. 'That's what's motivating us today to chart out a new and even more aggressive goal going forward.' The administration is also setting a goal of cutting the per-mile emissions from the agencies' vehicle fleet 30 percent, it said. It estimates the total commitment across the federal agencies will save taxpayers $18 billion -- funds that won't be spent on energy."