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. 2008 Sep 17;105(38):14245–14250. doi: 10.1073/pnas.0803838105

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© 2008 by The National Academy of Sciences of the USA

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Fig. 3. — Total SO₂ emission by nation (China, Germany, India, United Kingdom, and United States), for 1995 and 2005. The per-capita emissions (in kg) are indicated by the numbers in brackets on top of each bar. For 1995 emission in China, the mean value is calculated from refs. 25–27, and for 2005, the mean is calculated from refs. 25, 28, and 29 for China. Ref. 30 is used for emissions in Germany and the United Kingdom in 1995 and 2005. Ref. 31 is used for the United States, and ref. 32 is used for India.