In the 2008 Olympics, Beijing managed to reduce its carbon dioxide emissions by 24,000 metric tons per day compared with the previous year. If this could be maintained, and if other large industrial cities did the same, this could make a big impact on global warming. During the Beijing Olympics, these reductions in air pollution were associated with improvements in biomarkers of systemic inflammation and thrombosis in young people (read the abstract).

Olympic Games 27 July – 12 August

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