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— type or diverse taxonomic unit that can be threatened by extinction, unless the factors causing this threat are removed. Compare: Threatened species.

species or other taxonomic unit which is under a threat of diminishing or survival of which is impossible unless the threat causing factors are eliminated.

Any liquid that has percolated through the deposited waste at a landfill and is either emitted from or contained within the landfill. A leachate will have picked up disso