One of the largest consumer of fossil fuel energy and therefore producer of CO2 emissions is the Military with the U.S. being the largest across all 3 branches. In 2013 the US Department of Defence spent $14 billion for operational mission fuel alone. The US DOD has a stated goal that by the year 2020 they will derive at least 50% of their fuel requirements from alternative sources.
In Hawaii the Applied Research Laboratory with the University of Hawaii, using funding provided by the Navy are researching these different forms of alternative energy.
You can learn more about the greening of the US navy on their Green Fleet website.
Gordon's expertise in the area of industrial energy efficiency and alternative energy. He is an experienced electrical engineer with a Masters degree in Alternative Energy technology. He is the co-founder of several renewable energy media sites including Solar Thermal Magazine.