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Crutzen, P.J., Steffen, W. How Long Have We Been in the Anthropocene Era?. Climatic Change 61, 251–257 (2003). https://doi.org/10.1023/B:CLIM.0000004708.74871.62
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DOI: https://doi.org/10.1023/B:CLIM.0000004708.74871.62