In-House Memorandum ~ Ecological Vegetation Classes  “Thank God, men cannot yet fly, and lay waste to the sky as well as the earth!” – Thoreau[1] As Henry Thoreau [1817-1862] witnessed the gradual clearing of woods around his village in 1850s Concord, U.S.A., he pondered the consequences of ‘maltreating the face of nature’ and asked whether…

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