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population(3)
carbon(2)
desertification(2)
deserts(2)
forests(2)
humidity(2)
absorption(1)
agriculture(1)
air quality(1)
calcium(1)
carbon dioxide(1)
density(1)
diffusion(1)
eddies(1)
elements(1)
emissions(1)
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freeze/thaw(1)
grasslands(1)
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