The “hockey stick” chart, devised by Michael E. Mann, a meteorologist at Penn State, and his colleagues to show the sharp rise in world temperatures, was wielded by both sides in a duel of science and politics at a congressional hearing. Skeptics of climate-change theory savaged the chart — which had been elevated “to the level of an icon for greenhouse warming,” we reported — while the scientists did their best to explain their research. “Advocates on both sides of the climate-change debate,” said Mr. Mann, “have misrepresented the results for their own purposes.”
We’re sorry. Something went wrong.
We are unable to fully display the content of this page.
The most likely cause of this is a content blocker on your computer or network. Please make sure your computer, VPN, or network allows javascript and allows content to be delivered from c950.chronicle.com and chronicle.blueconic.net.
Once javascript and access to those URLs are allowed, please refresh this page. You may then be asked to log in, create an account if you don't already have one, or subscribe.
If you continue to experience issues, contact us at 202-466-1032 or help@chronicle.com