📁 荒漠化
Desertification is a man-made or natural process of degrading arable land into that which has such poor soil that farming is not possible or is nearly impossible. Human causes include over-farming, leveling forests for farm land or urban development, and the use of river dams. Natural causes include climate change toward less yearly rainfall, and erosion caused by water, wind or gravity.
条目 (12+)
Weed Killer Deforms Sex Organs in Frogs, Study Finds
http://www.nytimes.com/2002/04/17/science/17FROG.html