Related Links

NSF: Too Much of a Good Thing: Human Activities Overload Ecosystems with Nitrogen
http://www.nsf.gov/news/news_summ.jsp?cntn_id=117744&org=NSF&from=news

Virginia Institute of Marine Science: Dead zones continue to spread
http://www.vims.edu/newsandevents/topstories/2008-dead-zones-spread.php

AMNH Science Bulletins: China's Acidic Farmland (March 8, 2010)
http://www.amnh.org/explore/science-bulletins/(watch)/bio/snapshots/chinas-acidic-farmland