A study touting Genghis Khan's environmental record is being cheered by the team which produced Al Gore's movie, An Inconvenient Truth. Genghis Khan's great accomplishment for the green cause? Killing off 40 million humans so their un-tilled fields would be overtaken by forests. While some may find genocide morally repugnant, environmentalists had a different concern: Would reforestation be enough to overcome the greenhouse gases released by all those decaying bodies?  Julia Pongratz, who headed the Carnegie Institution's Department of Global Ecology research project from the Institution's Stanford University campus offices, provides the answer in a January 20 news release: We found that during the short...
