Two decades ago, the so-called “Hockey Stick” curve, published in 1999 by me and my co-authors , was featured in the all-important “Summary for Policy Makers” (SPM) of the 2001 IPCC Third Assessment report. The curve, which depicted temperature variations over the past 1000 years estimated from “proxy data such as tree rings, corals, ice … Continue reading A Tale of Two Hockey Sticks