National Public Radio: Marshes along streams and estuaries protect land from storm surges. But they're disappearing fast and now scientists have discovered a previously unknown marsh killer: nutrients. Nitrogen from fertilizers and sewage makes marshes grow faster, but the roots grow smaller so the soil can't hold the bigger plants. That means soil banks collapse and marshes turn to mud.
URL: http://www.npr.org/2012/10/18/163132026/scientists-solve-mystery-of-disappearing-salt-marshes?ft=1&f=1025
Enclosure: http://www.npr.org/player/v2/mediaPlayer.html?action=1&t=1&islist=false&id=163132026&m=163132003
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