Yale Environment 360: A spike in Chinese air pollution over the last three decades has caused a 60 percent increase in the levels of nitrogen pollutants that ultimately end up back on the nations land and in its water, a new study has found. In an analysis of 270 monitoring sites across the country, researchers found that the annual deposition of nitrogen, as measured in precipitation, had increased from 13.2 kilograms per hectare in 1980 to about 21.1 kilograms per hectare in 2010. Scientists say so-called nitrogen...