what causes hockey stick graph
The âhockey stickâ graph was the result of the first comprehensive attempt to reconstruct the average northern hemisphere temperature over the past 1000 years, based on numerous indicators of past temperatures, such as tree rings.limate myths: The âhockey stickâ graph has been proven wrong. The hockey stick: The original and later versions. Temperature reconstructions of the past 1000 years. See all climate myths in our special feature. Updated&colon; See final section.