...some cities. Both the European Commission and the US have ordered...Alexander Farrell of the University of California, Berkeley, published in Science...compared with petrol. In Brussels the Commission has found that the standard production...group, says the green lobby is gambling on what he calls an “unusual alliance...than oil imports. According to the Commission study, its target of replacing 5...that could help break Opec’s control of the world’s fuel supply...By James Mackintosh