Because of the growing demand for agricultural products, it is increasingly important to use one of our precious resources, farmlands, as efficiently as possible so that we can not only produce enough food, but also help save the environment.
 According to the Agency for Renewable Resources (FNR), in 2007 Germany will use around 5 million acres (17% of the available farmland) to grow crops for renewable energy purposes. Rapeseeds alone, which are used to make bio diesel, will be grown on half of this land.
A comparison of the different bio-fuels shows how different the amount of netted energy can be. With bio methane produced from one hectare of land, a car with just an average fuel efficiency can drive 42,000 miles (67,600 kilometres), which is no less than 1.5 times around the earth!
That is the equivalent of 1,320 gal (5,000 L) of fossil fuels. Bio diesel from rapeseed or ethanol from corn can only go 1/3 the distance from the same amount of land.
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MT-Biomethan 
