Other species may adapt. It is more likely on balance that global climate change will bring adverse impacts to New Hampshire's forests. In general, ecological models predict that warmer temperatures and extreme weather events associated with climate change would move optimal conditions for the growth of northern hardwood forest species northwards by at least 100 to 300 miles by the end of the next century. Climate change of the magnitude predicted by some of the current climate models may both alter the species of trees and cause decline and widespread mortality in the forests of the White Mountains. Disturbances will increase, e.g. pest and pathogen outbreaks, flooding, and wind damage.
Disturbances can kill a large number of trees and forests.
Sugar maple, ash, and yellow birch, all northern hardwoods, are sensitive to extreme weather events and may decline or even collapse. Foliage may dull, brilliant fall colors will fade and become more brown as trees sicken, drop leaves early and other less colorful southern species move north. Forest products is the fourth largest employer in New Hampshire and third in terms of revenue. Gross revenues may be affected.