Alarmism about global warming has been dealt yet another body blow, as the so-called “settled science” gets some unsettling data.  Anthony Watts of Watts Up With That (hat tip: John Hinderaker of Powerline) reports on a new study of tree ring data indicating the long term trend has been cooling for the last two millennia:  As the international team of researchers from the Czech Republic, Finland, Germany, Greece, Sweden and Switzerland describes it, this history depicts “a long-term cooling trend of -0.30°C per 1,000 years over the Common Era in northern Europe” (see figure below). Most important of all, however, they note that their temperature reconstruction “has centennial-scale variations superimposed on this trend,” which indicate that “conditions during Medieval and Roman times were probably warmer than in the late 20th century,” when the previously-rising post-Little Ice Age mean global air temperature hit a...(Read Full Post)