Why Trees Stop at the Alpine Zone, and Why a Greener Summit Is Worth Watching
Climb toward a northern Appalachian peak and the trees run out before the summit does. They get shorter as you gain altitude, then vanish at the alpine zone, where the climate is harsh enough that the plants cling close to the ground rather than stand up in trunks and branches. That strip — call it an island in the sky — is what makes the next finding interesting. Researchers writing in The Conversation Canada used 41 years of satellite imagery of mountains across the northeastern United States and Québec's Gaspé Peninsula, and they report that these summits are slowly greening. A summit that turns greener is a summit where something is finding a foothold.
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Worth separating two things here. A greening signal gathered from orbit is a statement about how the summits look from above; 'trees are marching uphill' would be a statement about which species actually moved in.
The researchers do name the stakes in their own terms: what a greener summit means for the plants that live where cold and wind are too extreme for trees to survive. That is the question the greening trend hands them.