Average global temperature over the last ~2,000 years. Note the massive uptick on the far right side. Courtesy Science/AAAS Back in 1999, Penn State University climate scientist Michael Mann released the climate change movement’s most potent symbol: The “hockey stick,” a line graph of global temperature over the last 1,500 years that shows an unmistakable, … Continue reading The Scariest Climate Change Graph Just Got Scarier