About 900 species of plants and animals have gone extinct in the last five centries, and more than 10,000 others are now on the verge of joining them. Here's a look at some of the countries with the greatest potential for both disaster and improvement.

Endangered Species
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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.