High mechanization in combination with extensive clear-cutting has very adverse environmental consequences.
But extensive clear-cutting destroyed its habitat, and by the mid-20th-century, the red-crested bird was thought to have vanished.
Clear cutting forests produces an impact on climate change.
Consider the impact of clear cutting on Canada's Great Bear Rain Forest.
There, he witnessed the destruction of streams by the erosion resulting from clear cutting practices.
Harvest may be by clear cutting (but only for pure spruce stands) or by selective cutting.
Niemistö et al. (2012) found that retaining the understorey spruces decreased the productivity of cutting by 6 17% as compared with clear cutting where the understorey was not considered.
Group 9 has a relatively high amount of clear cutting.
Consequences of clear cutting and regeneration are mentioned above.
Particular forest management types, however, may produce even-aged stands by clear cutting.
Clear-cutting the Catskills would also seem advisable.
