A slew of interesting letters in today's Times newspaper continuing a debate on biofuels, renewables and hydrogen.  Rob Thring, a Professor of Fuel Cell Engineering, argues that;

" if all the cars in Britain could be converted to run on fuel cells using hydrogen from electrolysers using electricity obtained only from wind turbines, we would need only 20,000 wind turbines to do that. Britain could do that in 20 years, and then we would not need petroleum imported from politically unstable areas to fuel our cars."

On one level, it's not quit