Reference
Ruddiman, W., 2003: ‘The Anthropogenic Greenhouse Era Began Thousands of Years Ago’, Clim. Change 61, this issue.
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Crowley, T.J. When Did Global Warming Start?. Climatic Change 61, 259–260 (2003). https://doi.org/10.1023/B:CLIM.0000004716.42148.85
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DOI: https://doi.org/10.1023/B:CLIM.0000004716.42148.85