Considering Chad's provided multiple links to multiple studies and an overwhelming majority of scientists agree with those studies, I'd say that enough of that has been provided.
And this goes back to what I linked a little while ago. You (and many others) are looking for the definitive statement. The appeal to certainty - "Here it is! The missing link between climate change and human fault!"
That's not how scientists communicate. They will always use verbs like appears and seems and observed, and much like the congressional hearing in 1986 and 1987, those verbs are easily dismissed by people not in the field of science.
Thats how science works sancho. Absolute truth. They dance around these unproven hypotheses because they can't be proven. Its not a lot to ask for proof.
All of the "science" sample studies mostly look at 50 to 100 year elapsed time frames. That is such a short frame of time compared to the existance of the overall age of the Earth.
Say globals temps rose 1% from 1970-1990, and in 1990 there are more cars on the road than ever. That is still not a direct correlation or proof.
Temps have risen and fallen before automobiles. Natural disasters, observations of ice melting and reforming....have all happened before mills and cars were the norm. And at the same rates. Its out of context science with a pre desired outcome from the very begining for political reasons. And its not just in the global warmin debate. "Science" has been doing this in many areas for many years. Rearranging data and not placing things in appropriate big picture context in order to get a desired result for whatever reason - lobbyists, grants, their own existence which is funded by those who want this result.
If youve got enough money and power, and you want to share it with me - I can find you just about any result you want in the name of concrete "science". Oh, you are Coke's CEO, and want me to prove that Coke is better than Pepsi and that Pepsi possibly causes cancer? You got it. Give me a week. I'll have some nice pretty graphs and everything.
Phillip Morris CEO wants to pay me a million bucks to study the harmful effects of Mary Jane and why it is a dertriment to society. No problem. I'll even color code the charts for that much, and put it in power point for you. We will even have Starbucks for the presentation.