U.S. areas with no or low human footprint

Footprint includes: built environments, roads, railways, cropland, pasture land, navigable waterways, human population density, and night-time lights.

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Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.