Those who believe in catastrophic global warming often rely on data which show that over the past millennia, global temperatures were relatively constant, but beginning in the late 1800’s a dramatic increase occurred as a result of our burning of fossil fuels. While this so-called hockey stick graph is certainly convincing, it seems to contain several flaws. To begin with, it omits a known warming trend called the Medieval Warm Period, which lasted 600 years, as well as the Little Ice Age which followed for another 300 years. Since new research now reveals data flaws and methodological errors, it’s little wonder the National Academies of Science recently proclaimed this infamous greenhouse hockey stick graph all but broken!