Today, as urban population explodes globally, cities become more crowded.
今天，随着全球城市人口激增，城市变得更加拥挤。
But it will take up so much land that crowded cities become more crowded.
但是这种方法也会占有许多土地，使本来拥挤的城市变得更拥挤。
Our cities will continue to become more crowded and noisome. The landscape will get more cluttered, the air and water even dirtier.
我们的城市会变得越来越拥挤，景色会变得更加杂乱，空气和水也会变得愈发肮脏。
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