Climate record highlights extent of man-made change.
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References
SiegenthalerU., et al. Science, 310. 1313 - 1317 (2005).
SpahniR., et al. Science, 310. 1317 - 1321 (2005).
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Hopkin, M. Greenhouse-gas levels highest for 650,000 years. Nature (2005). https://doi.org/10.1038/news051121-14
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DOI: https://doi.org/10.1038/news051121-14