Well, I must admit that all this carbon foot print / global warming mania is sheer nonsense. There is much agreement amongst scientists that the world is warming, but what the hell do we think we can do about it? Surely it is not all man made, it is a just natural cycle of warming and cooling of the earth. Being a greybeard (no doubt like Geoff) I remember years ago being told that we were heading for the next ice age. They whoever "they" are, are only surmising, I wouldn't worry too mcsh about it (bit like the 2000 millenium disaster when "they" told us everything was going to shut down if it had a micro chip in it) the Chinese and Indians aren't caring much, no wonder their economies are growing.
