Alpine Greening Threatens Rare Northeast Mountain Plants

A Dartmouth study links faster-growing plants and nitrogen pollution to the decline of cold-adapted alpine species in the Northern Appalachians.

Updated on Nov. 6, 2026 in Botany

Wide landscape of a windswept alpine summit ridge with low shrubs and cushion plants over pale granite, dark forest in the valley below. — Dartmouth researchers found faster-growing plants fueled by warming and nitrogen pollution are displacing cold-adapted species on Northeast mountain summits. AI Illustration. Upload story photo >

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Researchers at Dartmouth found that alpine greening is pushing out slow-growing, cold-adapted plants on Northeast mountains. The study analyzed satellite imagery of the Northern Appalachians dating back to 1984.

Why it matters

Alpine zones host unique plant ecosystems, and many of these plants share more traits with Arctic species than with lower-mountain plants. Their decline signals how warming and pollution are reshaping mountain landscapes across the United States.

The Dartmouth analysis relied on satellite imagery of the Northern Appalachians starting in 1984, with significant greening detected on peaks including the White Mountains in New Hampshire. The study does not quantify how much of the greening is driven by nitrogen deposition versus warming, and the recovery time for trampled alpine plants is not specified.

The players

Dartmouth College

Dartmouth College is a private Ivy League research university in Hanover, New Hampshire, whose researchers conducted the alpine greening study.

Green Mountain Club

The Green Mountain Club is a Vermont nonprofit founded in 1910 that maintains the Long Trail and works to protect the state's mountain ecosystems.

The details

Milder conditions tied to climate warming are favoring faster-growing plants, while nitrogen carried by prevailing winds from Midwestern power plants acts as fertilizer for some alpine species. Alpine plant root systems are very shallow, so even a few footsteps can kill them, and recovery from trampling takes a very long time.

1984: Satellite imagery analyzed in the Dartmouth study begins.
1970s: Nitrogen pollution was previously linked to acid rain in the Adirondacks.
November 5, 2026: Dartmouth's alpine greening study is reported by WCAX.

Big Picture

Nitrogen pollution from power plants was first documented as a regional problem through 1970s Adirondacks acid rain research, and the Dartmouth study extends that thread to alpine ecosystems. Alpine greening now shows that the effects of that airborne pollution reach the region's highest and most fragile plant communities.

Hikers visiting alpine zones on Northeast peaks may encounter fragile plant communities where even a few footsteps can cause lasting damage. Staying on marked trails protects shallow root systems that recover very slowly from trampling.

The takeaway

Alpine plants are among the slowest to recover from damage, so staying on marked trails is one of the most effective ways visitors can help protect them. Monitoring of these high-elevation communities will show how warming and pollution continue to reshape the region's mountains.