And then move up into Ponderosa pines, then in upper elevations spruce and fir forest, and then finally to some sort of alpine tundra up at the top.

NPR: Warming Will Create Micro-Climates, Scientists Say

The open valley turns to a forest of tall fir trees, many hung with moss.

BBC: Hiking the Alpine Walserweg trail

It was a damp day and, after he had parked the van and set off down the forest track, even the noise of the Edinburgh-Glasgow motorway was muffled by thick, dark fir trees.

ECONOMIST: Robert Taylor