An End to Climategate? Penn State Clears Michael Mann - Political Hotsheet - CBS News

Tree data showing global temps going down didn't mesh with actual recorded temperatures, so pains were taken, (most of the time disclosed, but sometimes not) to use actual temp recordings and "hide the decline" from trees. Sometimes, on the so called hockey stick charts that show global temps as a flat line and then a sharp upward spike are indeed mixing tree ring data and actual temps. Earlier this year the Penn State investigators, like most mainstream scientists, dismissed this part of the fraud charge, finding no "fraud' in the use of actual temp data -- the spiking part of the hockey stick -- which on its own is not in dispute.