Global Warming's Hokey Hockey Stick

In the scientific and political debate over global warming, the latest wrong piece may be the “hockey stick,” the famous plot [that] purports to show that we are now experiencing the warmest climate in a millennium...Canadian scientists Stephen McIntyre and Ross McKitrick have uncovered a fundamental mathematical flaw in the computer program that was used to produce the hockey stick...How does this bombshell affect what we think about global warming?"