BBC: It’s not every day you look in a compost heap and find a bug which might help save the planet. But a UK company is using just such a bug to make renewable fuel for cars. Viewed through a microscope at TMO Renewables near Guildford in Surrey, hundreds of the new bacteria can be seen on the move. Each is little more than 2% of the thickness of a human hair. But they have a potential which could be of enormous significance. They turn rubbish into ethanol. And the …