I am not sure how they come up with their numbers. Wikipedia says that in the US an electric car would emit less than half of the CO2 of a gas powered equivalen

I am not sure how they come up with their numbers. Wikipedia says that in the US an electric car would emit less than half of the CO2 of a gas powered equivalent. http://en.wikipedia.org/wiki/Electric_car#Carbon_dioxide_emissions http://en.wikipedia.org/wiki/Electric_car#Carbon_dioxide_emi... And it seems that the UK uses less coal power than the US. Thus, the emission reductions in the UK should be even better, i.e. more than 50%. But the article says the emission reductions are only 20%. I wish they would tell us more about their calculations. With these types of estimations, one can bring about drastic changes of the conclusion with subtle changes of the assumptions in the estimate.