Cheers Architect, for the link and for my fopar, I get the two mixed up, quite often to the laughter of the physics bods at uni in the pub!

as for the article, ive got to say that at the end of it its an argument, not a full fact, on the fact of emissions the article is basing the fact on lack of cloud covering, which at best is based on scientific knowlage and, well a bit of luck (when did you last see a weather report be spot on) they only looked at a very specific time only analysing a small proportion of time in the month, theres no real look at the temprature variation prior to aircraft, not that this is associated with the study, and there looking at cloud trails which as far as I know is a bit chaotic at the best of times.

On another note if it is correct, which I would agree with with fruter study, the fact of global warming dosent it ACTUALLY show that were making a difference to the world, not as the article suggests, helping it?????