That's why you should ignore the so called experts such as Al Gore, other mouthpieces, and outlier scientists. Certain interest groups are trying hard to throw mud all over the issue to obscure and diffuse it so people don't care, or come to faulty conclusions based on biased (or false) sources.
What matters most is what the general scientific community thinks on the issue, and the science and data itself.
Wikipedia does a pretty good job of offering all the evidence, best of all it has a 126 item reference list with all the research and papers that went into the wiki entry if you want to look over the research yourself (its only a small fraction of the total body of evidence though). It also has a lot for further reading, and many links too.
Skepticism is very important in science, a good scientist should always retain a degree of skepticism about any topic or theory, but that skepticism needs to be followed by investigation to verify if the skepticism is valid or not. Just saying you are skeptical is not enough, it needs to be backed up.