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globalchange

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algae(1)
carbon dioxide(1)
deserts(1)
ecosystems(1)
erosion(1)
fractals(1)
grasses(1)
grasslands(1)
grazing(1)
lichenology(1)
mosses(1)
physical geography(1)
porosity(1)
snow(1)
soil ecology(1)
thawing(1)