"Forty years ago, this part of the mountain would have been blanketed with cold-loving red spruce and balsam fir trees. But today, warmer-loving northern hardwoods such as sugar maples and American beech are taking over.
...in the transition zone, where northern hardwoods quickly give way to the dark spruce-fir forest, the change was dramatic.
...a study published earlier this month in the Proceedings of the National Academy of Sciences that found that the boundary between northern hardwoods and colder-loving trees shifted about 350 feet uphill in the last 40 years in response to warming temperatures." LINK
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