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Ecosystem functions and services

Ecosystem functions and services

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(Alexander et al. 1997). Similarly, although sulfur is an essential element in proteins, excessive sulfur emissions from human activities lead to sulfuric acid smog and acid rain that harms peo-ple and ecosystems alike (Alexander et al. 1997). Phosphorous (P) scarcity limits biological nitro-gen fixation (Smith 1992). In many terrestrial eco-

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