Alaskan springs are now two weeks earlier allowing plagues of moths to eat all the needles of entire forest regions in one summer. The trees die and then usually succumb to forest fires that destroy soil vegetation and accelerate the melting of the permafrost.
In 2003 Siberia there was a record number of forest fires losing 40,000 sq kms.
Similar changes are occurring in Alaska…warming there has shortened the life cycle of the bark beetle from two years to one, causing huge infestations and subsequent fires which destroyed huge areas of forest in 2004. ”
( F. Pearce, “One degree and we’re done for” New Scientist Vol 2571 30th September 2006 pp8,9)