Raw Vs. Homogenized Data
Willis Eschenbach over at Watts Up With That? has a detailed examination of how the raw data from Australian temperature reporting stations was massaged. The raw data actually shows a substantial cooling over the last century. Eschenbach then explains the theory behind adjusting the raw data to correct for movement of weather stations, loss of data, etc.--and why CRU's "adjustments" seem arbitrary and intended more to fit what they wanted to find, than based on anything that qualifies as science. It's a long and detailed discussion which I am reluctant to quote in fragments. But go read it, and see why many people are more than a little skeptical that we're being told the truth.