I've been an environmentalist for 25 years now... Some people might think I'm a bit of a fanatic. Jeremy Clarkson would, no doubt, belittle my desire for a greener, healthier world for this and future generations by saying I'm an 'arty-farty, Lycra-clad cycling leftie-weftie who knits his own muesli' - or, more likely, would just punch me in the face. But I don't care. Because I know that unless every one of us does our bit (and is clearly told what 'our bit' is), we face a very unpleasant future.