Behind the Hockey Stick

Following on from Tide turns on the green-mongers, there is an article at Scientific American. In accordance with their terms of use, here follows their link:

Scientific American: Behind the Hockey Stick
Seven years ago Michael Mann introduced a graph that became an iconic symbol of humanity's contribution to global warming. He has been defending his science ever since

Michael Mann maintains a weblog at www.realclimate.org

The lead article for the March 2005 edition is (you will need to either buy the magazine or subscribe online to read the whole article):

Scientific American: How Did Humans First Alter Global Climate? [ CLIMATOLOGY ]
A bold new hypothesis suggests that our ancestors' farming practices kicked off global warming thousands of years before we started burning coal and driving cars

As I only got the magazine today, I will not comment further until I have read and digested these article.