I begin to see the enormity of Kurt's statement regarding CO2 production, in light of increased solar output- it bears repeating. The argument that the solar component is at least partly responsible for a rise in global temperature, is itself actually a strong reason to curtail man-made CO2 production. Once a runaway greenhouse effect is triggered there may be no way available to mankind to slow or stop it. Since the threshold is unknown, it seems that any addition to the CO2 total concentration should be avoided. IIRC, the sun's output has increased some 30% in the past few billion years, and will increase by a like amount for the remainder of it's main-sequence life. Not that we'll be around that long, but it illustrates that we have a delicate balance here and now, and without further understanding of the exact implications, producing gigatonnes (!) of CO2 seems foolish in the extreme. ____________________________________________________________________________________ Cheap talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. http://voice.yahoo.com