The National Academy of Sciences has released a report confirming the last few decades of the 20th century were warmer than any during the last one-thousand years. A team of scientists including UMass Amherst’s Raymond Bradley originally made the claim in the 1990s. They illustrated a “hockey stick” effect — a graph depicting a downward trend in temperature until the 20th century, when the graph abruptly rises. The scientists could only explain the change because of an increase in greenhouse gases. These findings set off a political firestorm, forcing the Academy to re-examine the evidence. WFCR’s Karen Brown spoke with Raymond Bradley about the politics of his report.