Tree Ring Lab | Lamont-Doherty Earth Observatory
The Lab's tree ring work in the U.S. Southwest documents a history of drought. Ed Cook (above) published a landmark paper in 2004 describing past megadroughts that extended for hundreds of years. Later work with bristlecone pines tracked 1,100 years of El Nino/La Nina fluctuations . Photo: Paul Krusic. Learn more about the Tree Ring Lab's ...