I had a lil' discussion with one of my best friends last friday about this subject. He is a, well, climate-freak and he stated that climate change and climate problems are the biggest problems to solve for humanity in the coming century. He didn't respond on my argument that policies made to counter climate problems only have effect when they are global solutions, otherwise you will simply destroy your country's export, nor did he answer me when I asked him what his solution was. He just stubbornly stated that it was the worlds biggest problem and that I am a fool for not seeing it, and that I'm not willing to solve it. Now, back to the title. The evidence for climate change seems to be as thin as paper to me - or maybe I am looking at the wrong sources. The only real 'evidence' that I ever found, and to which teachers at my school constantly refer to when adressing this subject, is a pair of graphs in which the amount of carbon dioxide and the average global temperature are shown rising explosively since the industrial revolution. What is your opinion on this? Where are the facts? Please, enlighten me.