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Throughout history, key scientific discoveries have transformed our understanding of the world. Things like heliocentrism, the law of motion, and natural selection. Today we view these scientific claims as major strides in the progress of civilization, but in their time, people thought they were pretty crazy.
As crazy, some would way, as the idea of the earth's temperature steadily rising.
Since the early 1980's, climate change has gone from radical idea, to imperially proven scientific fact. It's also started a war; pitting scientists and environmentalists against corporate-funded think tanks, and a handful of contrarian scientists, pundits, and politicians.
Michael E. Mann has been on the front lines of this battle for over a decade. He became famous in the late 1990's, when he authored the now infamous hockey stick graph; a chart that shows how temperatures have risen over the past thousand years. It was used by the UN to confirm the reality of global warming, and Michael shared the Nobel Peace Prize for his work. But he also became a target for climate-change deniers. in 2009, his email account was hacked and Michael and other climatologists were accused of manipulating or hiding data. They've all since been cleared, but the attacks haven't slowed. If anything, the battle is intensifying.