Almost no UK politicians have studied any science subjects at school, so when they need advice on cutting greenhouse gases, they tend to turn perhaps to a school mate, maybe one who works in industry, rather than listen to experts they employ. And a decision this week has BP’s footprint all over it, with the Department for Transport Secretary Grant Shapps saying he is going out to consultation on whether or not it should put 10% of Ethanol into petrol rather than the existing 5% maximum, with the claim that it is greener and cleaner and would cut emissions by the equivalent of taking 350,000 cars off the road. Well is it? Rachel Solomon Williams, Head of Low Carbon Fuels…