Water quality is the most important environmental concern facing U.S. agriculture.
Policies that address climate change also impact other environmental parameters. The above map shows the reduction in nitrogen in the various sub-basins of the Mississippi River Basin. Please note that the map does not account for the amount of nitrogen that is lost enroute to the Gulf. For an accurate estimation of the actual amount of nitrogen entering the Gulf, delivery ratios for nitrogen reaching the Gulf needs to be attached to each sub-basin.