Not quite sure about Global Warming

My contention with the global warming theories and greenhouse effects is that we don't know enough to jump to conclusions. We are still learning how climate changes work and why they happen. We can't even predict what the weather is going to be like in 2 days but some claim they know what is going to happen in 50 or 100 years. I just found an article that demonstrates that we are still learning and should stop going off of assumptions. You what assuming does right?

Cold Water Thrown on Antarctic Warming Predictions

**Side Note: Did you see that the "man-made" ozone hole is actually serving a benefit in Antarctica? Kind of humorous.

Anyway, I think that we need to spend a lot more time getting to understand the earth and how it works before we going jumping to conclusions.