An article int the journal Science reports that trees in Western and Northwestern USA are dying at twice the rate of a few decades ago. The climate is changing around them, and the cannot move to escape.
The New York Times reports
“The higher mortality rates held regardless of tree size or type or elevation at which it grew. The fact that birth rates remained unchanged among the nearly 60,000 pines, firs, hemlocks and other trees in the study indicates that forests are losing trees faster than they are replacing them”
http://www.nytimes.com/2009/01/23/us/23trees.html
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Tree Deaths Double
An article int the journal Science reports that trees in Western and Northwestern USA are dying at twice the rate of a few decades ago. The climate is changing around them, and the cannot move to escape.
The New York Times reports
“The higher mortality rates held regardless of tree size or type or elevation at which it grew. The fact that birth rates remained unchanged among the nearly 60,000 pines, firs, hemlocks and other trees in the study indicates that forests are losing trees faster than they are replacing them”
http://www.nytimes.com/2009/01/23/us/23trees.html