A new Pew Charitable Trusts report reveals the United States Air Force has reduced energy consumption over the past six years by 20 percent, as the military looks to continue going green.

"The military's reliance on fossil fuels compromises combat effectiveness by restricting mobility, flexibility and endurance on the battlefield," according to the new report, as government officials work with private contractors.

Going green is a popular initiative in the U.S. government at the moment, especially among Air Force officials who are interested in developing alternative fuel sources.  Since the Air Force uses more energy and natural resources than the other branches, there has been an even higher urgency for fuel efficiency and eco-conscious projects.

In addition to heavily researching biofuels and green spy planes, the Air Force also is developing solar farms, wind turbines, and power plants at airbases in select locations.  There also are 37 airbases that have renewable energy sources partially powering bases, with the overall number of bases expected to increase.

The Air Force recently performed a successful test flight of an A-10 fighter jet with a mix of 50/50 jet fuel and camelina weed mix.

Military officials and lawmakers plan to work with other contractors to help spur new green projects for use by the military.  The U.S. Army has given EnerDel a contract to make a hybrid Humvee battery, as Army officials also look at various ways to make greener vehicles.

Even though the military is testing biofuels, numerous trials must be conducted before the new fuels will be used during live missions.