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globalchange

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population(1661)
carbon(1627)
conservation(946)
emissions(861)
lead(709)
precipitation(680)
forests(617)
density(610)
carbon dioxide(521)
vegetation(516)
biomass(506)
lakes(500)
surface water(473)
heat(445)
nitrogen(429)
landscape(398)
mortality(369)
agriculture(348)
atmosphere(346)
sediments(346)
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