> Nature goes it cycles, on the order of maybe hundreds or thousands (or more) years. It's been way colder in the past than it is now, and it's also been way warmer in the past than it is now.

I'm pretty sure that climatologists are acutely aware of the nature of the climate.

> But have we definitely teased out our effect on the temperatures from what the earth is doing on its own anyway? I'm still skeptical. Who knows, maybe there's a pattern in the earth's cosmic orbit that accounts for 99% of the warming. Or maybe it's only 1% and we're the 99% cause and Al Gore was right. But until I see this definitive proof, I have to stay skeptical.

According to the IPCC AR 5 (which I'm sure a well-informed skeptic such as yourself have perused), there is a 95-100% probability that greenhouse gas emissions resulting from human activity are responsible for at least half of the warming observed from 1950-2010. Are you not satisfied with this certainty level?