 So what images, Nick, spring to mind when you consider the world's most polluting industries? There's gas-guzzling air travel, shipping's got a pretty whopping carbon footprint too. You might be forgiven for not thinking immediately, and Nick, I don't mean this to sound too indelicate for the first programme of our shift, flatulent farmyard animals, but the Danes at least are stealing a march on methane. The Copenhagen government is on a mission to drastically slash emissions immediately,