That diagram is similar to those from the earlier studies done by Hughes and other researchers. At the time of the original research, it was called a "hockey stick" diagram.

It backs some of the key findings of the original study that gave rise to the iconic "hockey stick" graph. The diagram, which shows a sharp upturn in temperatures in recent decades, has been a prime ...

That diagram is similar to those from the earlier studies done by Hughes and other researchers. At the time of the original research, it was called a "hockey stick" diagram.