Following on from what you say about making it easier finding sites after felling/denuding of tree cover. I was amazed to read several years ago about how the supposed 'pristine' Amazon rain forest is nothing of the sort. All the clear felling of these arboreal behemoths has shown that the area was heavily populated (well WAS populated, but later deserted) prior to the forest growing up, and may have been an Inca/Aztec/Toltec type interspersed metropolis 5 or 600 years ago. Fascinating stuff, though still sad about the wanton denuding of such a species rich landscape.
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