"If man has not found ways to deal with environmental problems such as water and air pollution by 1998, it will be too late. The future is not determined and it lies in our own hands."

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Children whose developing lungs are particularly vulnerable suffer the most from air pollution. For children, breathing the air in cities with the worst pollution, such as Beijing, Calcutta, Mexico City, Shanghai, and Tehran, is equivalent to smoking two packs of cigarettes a day.

— Lester R. Brown