Any dogmatic assertion is unwarranted. For instance, this article make an interesting argument:
http://www.co2andclimate.org/climate...v3n16/hot1.htm
However, in just perusing down the lists of titles generated from a search one can readily see that there is a whole variety of positions and “proofs” to choose from. After reading a few rabidly anti-human articles and a few confident “the volcanos did it” articles, I can confidently assert that I don’t know and neither does anyone else. The evidence is inadequate. I BELIEVE, based on the data I have seen, that volcanos have in the past and still do cause at least variations in the ozone. I suspect that man does so as well. Certain theories can be put forward, based on the available data, both pro and con, but none are conclusive. I KNOW (as much as is humanly possible) from the facts recorded in the rock and ice of our planet that the sun, volcanos and outgassings from subterranean sources WILL change the atmosphere and climate over time. Our ability to do so has not been proven, but I know we can if we try. Time will tell.
Edit for dogmatism.
[ February 13, 2004, 23:09: Message edited by: solops ]