Michael Mann's magical trees

From this Climate Audit post:

What we’re going to see is that in Mann-world, U.S. tree ring series are capable not merely of reconstructing world temperature, but 9 different “climate fields”. In effect, using Mann’s algorithm, one doesn’t need to leave the U.S. to reconstruct world climate in as much detail as one could ever want. It’s funny that actual U.S. temperature readings in the 20th century are held to be unrepresentative of world climate, but U.S. tree rings have such remarkable properties.