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"We see silviculture as part of the overall pest management strategy," says Jetton.

This led to the formation of the Imperial Forest Service, whose main mandate was to aid in British silviculture.

Each side can point to plenty of competing examples, said John Bailey, professor of silviculture and fire management at Oregon State University.

"All these steps are in the right direction, but the challenge is big and complex," said John Bailey, professor of silviculture and fire management at Oregon State University.

That supports the “silviculture” hypothesis, the idea that the trees were purposefully reserved or farmed for the cathedral.