The problem is that the time intervals defy attempts to quantify anything. The Medieval Warm Period was left out of the “Hockey Stick” one bit of evidence that the error may not have been accidental. There are a number of good web sites that present both sides of the issue. Here’s one.

This guy makes the best arguments on statistics plus he has addressed the issue of whether warming is a bad thing.

Here’s one of my blog posts with some examples of scientific ignorance.