A very interesting piece on The Economist about the energy needs of the US military. Armoured tanks consume an amazing amount of fuel, and this has been in numerous occasions an hindrance to US operations in Afghanistan or Iraq. Not only that, a gallon of fuel can cost up to 400$ when all the transport costs are added up. The navy seems to be at the forefront in the search for more cost-effective alternatives.
"The need for alternative sources of energy is a military necessity."