[PCA] NEWS: How cities drive plants extinct

[Olivia Kwong]

http://news.bbc.co.uk/earth/hi/earth_news/newsid_8295000/8295738.stm

How cities drive plants extinct
by Matt Walker
Editor, Earth News

How towns and cities cause the extinction of local plants has been 
revealed for the first time.

An international team of botanists has compared extinction rates of plants 
within 22 cities around the world.

See the link above for the full article text.