text: According to real scientists, the graph also gave extreme weighting to datasets that showed unusual 20 th -century warming at the expense of those that did not. And the program that Mr Mann created to draw the graph would have shown the 20 th century as unusually warm even if random red noise rather than real-world data were fed in. There were numerous other statistical curiosities. Mr Manns graph is perhaps the most laughable and widely-discredited object in the history of bad science supporting worse politics.