Thirty-eight US national parks are experiencing "accidental fertilization" at or above a critical threshold for ecological damage. Unless significant controls on ammonia emissions are introduced at a national level, little improvement is likely between now and 2050.
Fuente : http://www.eurekalert.org/pub_releases/2013-10/hu-...
Fuente : http://www.eurekalert.org/pub_releases/2013-10/hu-...