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The geopolitics of pollution has the potential to turn toxic. If you thought Asia’s territorial disputes were a barrier to peace and cooperation, just wait until blackened skies dominate summit meetings. And they will, as nationalists in Japan, South Korea and Taiwan use pollution as a rallying point to gin up anti-China sentiment; business leaders in Hong Kong express anger about having trouble recruiting foreign talent; China lashes out at independent reports on health risks; and the world points fingers at the Communist Party as climate change accelerates.