Not sure if this has been mentioned previously, but here's a link to a BBC story on something very disturbing now occurring in British trees:
http://news.bbc.co.uk/1/hi/sci/tech/3291011.stm
http://news.bbc.co.uk/1/hi/sci/tech/3291011.stm
Lets hope they can come up with something natural instead of spraying whole forests with fungiside, doing untold damage to the local environment.so that the scientists can suss out the fungus and try to come up with an antidote.