The Hockey Stick is baaaack!!!
The (in)famous Mann et. al. Hockey Stick is back again and
Climate Skeptic is all over it:
Deconstructing the Hockey Stick
Will there ever be a time when sane people are not having to deconstruct yet another repackaging of Mann's hockey stick, like some endless wack-a-mole game? Mann is back with a new hockey stick and, blow me away with surprise, it looks a heck of a lot like the old hockey stick.
Read on and follow the links. Basically, Mann uses 95 Climate Proxies to try to reconstruct the Earth's average temperature for the last 1,000 years. What is shown is a sudden increase in temperature in the last hundred years or so.
There are two Climate Proxies in question - one of which is known to be corrupt (lake sediments which have been disturbed and mechanically mixed up). Remove
these two Proxies and the temperature chart looses that sudden uptick.
UPDATE: I misread -- the Lake Sediment is one Proxy. The other is Bristlecone Pine tree-rings of which Mann used a number of instances so the bogus Proxies total about 20% of the whole and not just two out of 95.
Posted by DaveH at November 27, 2008 10:50 AM