即使（不切实际地）假设煤炭导致了世界上所有的空气污染，我们可以使用煤炭每年为三十亿能源缺乏者生产每人250千瓦时电力，而且最终还能降低空气污染。
Even assuming (unrealistically) that coal produces all of the world’s air pollution, we could generate 250 kWh/year with coal for every one of the three billion energy-poor people and still end up with lower air pollution.