New York Times: A new ranking of the world`s nations by environmental performance puts some of the globe`s largest economies far down the list, with the United States sinking to 61st and China to 121st. In the previous version of the Environmental Performance Index, compiled every two years by Yale and Columbia University researchers, the United States ranked 39th, and China 105th. The top performer this year is Iceland, which gets virtually all of its power from renewable sources — …