Fake skeptic Richard Muller convinced the Koch Brothers to give him money, so that he could generate a fake temperature graph, pretend it had converted him from a skeptic to an alarmist, and then achieve fame through his fake global warming narrative.
Satellites show there has been no warming over the global land surface for the past 15 years.

Yet Muller’s group shows the land surface warming at a rate of about 3C/century during that same period.

Legitimate scientists would be very concerned about this huge discrepancy vs. more accurate satellite data, and would not publish until they had it resolved.
Muller was never a skeptic, and always wanted to prove that the Hockey Stick was correct.
By Richard Muller on December 17, 2003
Let me be clear. My own reading of the literature and study of paleoclimate suggests strongly that carbon dioxide from burning of fossil fuels will prove to be the greatest pollutant of human history. It is likely to have severe and detrimental effects on global climate. I would love to believe that the results of Mann et al. are correct, and that the last few years have been the warmest in a millennium.
Medieval Global Warming – Page 2 | MIT Technology Review
11/03/11
“It is ironic if some people treat me as a traitor, since I was never a skeptic“
Richard Muller, Climate Researcher, Navigates The Volatile Line Between Science And Skepticism