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It has been trying to restore the woodlands by introducing downy birch, sessile oak, hazel, willow, aspen and alder as well as endangered tree species such as Arran whitebeam.

Yes, stands of aspen and willows are thriving again — in some places.

In many areas, deciduous shrubs and trees, like willow and aspen, are moving in after a fire.

Seattle-based artist and journalist Jeff Rice recorded the sounds for this multimedia installation in Pando, a gigantic grove of interconnected quaking aspen trees in Utah — and one of the world’s largest single organisms.

Groves of aspen can mature within a half-century.