thanks. Quotes are nice, but I'm still looking for a link for these papers and stuff. What would be really helpful is if someone knew where to get the data on volcanic emissions. Carbon dioxide levels do not have to be %100 to be toxic, you just have to have enough to make you take in less oxygen than you need. OSHA established a level of 1,000 ppm over an extended period. The ocean is a sink. The solubility of CFCs is extremely low, but then you have to consider the VOLUME of the oceans.