The road net of the U.S. is one of the greatest human structures on earth (4 million miles in combined length, 1% of the land of the U.S).

The map of the United States below codes distance from roads.

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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.