'Unprecedented’ Tree Die-Off Hits Southern California.
Researchers from the U.S. Forest Service are documenting what they are calling an unprecedented die-off of trees in urban areas across Southern California.
Sycamores, willows, avocado and citrus trees are dying because of the drought, pests and disease infestations.
http://www.kpbs.org/news/2017/apr/26/us-forest-service-unprecedented-tree-die-hits-sout/
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