What's wrong with using tree ring data to created a climate record? The CRU researchers assumed that a tree grows faster when it's warmer. But rainfall has a stronger influence on tree growth than temperature does. Temperature is coorelated to tree growth only in the sense that it tends to rain more in warm eras. Critics call the CRU's approach the "tree-o-meter" theory.<ref>"[http://tomnelson.blogspot.jp/2012/02/email-3826-feb-2001-in-email-copied-to.html Email 3826, Feb 2001]," Tom Nelson, Feb. 04, 2012. "In one go, they tossed aside dozens of studies which confirmed the existence of the MWE [Medieval Warm Era] and LIA [Little Ice Age] as global events, and all on the basis of tree rings - a proxy which has all the deficiencies I have stated above."</ref> | What's wrong with using tree ring data to created a climate record? The CRU researchers assumed that a tree grows faster when it's warmer. But rainfall has a stronger influence on tree growth than temperature does. Temperature is coorelated to tree growth only in the sense that it tends to rain more in warm eras. Critics call the CRU's approach the "tree-o-meter" theory.<ref>"[http://tomnelson.blogspot.jp/2012/02/email-3826-feb-2001-in-email-copied-to.html Email 3826, Feb 2001]," Tom Nelson, Feb. 04, 2012. "In one go, they tossed aside dozens of studies which confirmed the existence of the MWE [Medieval Warm Era] and LIA [Little Ice Age] as global events, and all on the basis of tree rings - a proxy which has all the deficiencies I have stated above."</ref> |