First, we hear about hybrids not being as green as we think. Now, we are bombarded with another claim made by ecologist David Tilman of the University of Minnesota. Contrary to what the world believes, Tilman suggests that green fuels, such as bio-diesel and bio-ethanol are not as green as one believes. When all production factors are like the amount of oil used to sow, harvest, process and convert fuel crops into usable substances are taken into account these factors almost negates any environmental benefits. On this basis, corn-based ethanol reduced greenhouse gas emissions only by 12 per cent over standard petrol while Bio-diesel offered a better carbon savings of 41 per cent.
The UK Petroleum Industry Association (UKPIA) also told Auto Express:
About two million hectares could be given over to energy crops without affecting food production - enough to meet around five per cent of our fuel needs. Yet, beyond this level, major change to land use would be required, which could alter the CO2 balance.
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