Kaliningrad (Russia) is one of the most eco-friendly cities in the world.

Russian roads
The female and male duck. Photographer: O. Shulico
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Alex E

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.