BIODIESEL and ETHANOL
Although it is not the long term answer and is a limited resource, recycled vegetable oil can be used in most diesel motors and is a good alternative right now.
Non recycled biodiesel is most probably worse than diesel, due to the forest being cut down and burnt and then large food crops which are intensively farmed using petroleum agrochemicals.
Due to the increased demand for biodiesel an industry has now formed which is rampantly destroying more rainforest to make way for fuel crops. This takes land away from people most in need and increases food prices.
The main environmental advantage of using recycled vegetable oil as Biodiesel is that it is carbon neutral, so using 100% Biodiesel in your vehicle means you are not adding to the global warming crisis.
Biodiesel does not add any carbon because it utilises the amount of carbon which naturally circulates between the atmosphere and the biosphere (photosynthesis). Conventional fossil diesel however, does add to the overall level of carbon by extracting carbon deposited in the geosphere (mineral deposits) and releasing it into the atmosphere. Unlike any other available and easily accessible fuel at this time Biodiesel also has the potential of being 100% carbon neutral in its lifecycle too.
Check that the biodiesel you buy is from recycled vegetable oil and not virgin oil.
To find out your nearest filling station see