Less than a decade ago, this city was an industrial wasteland1. The sky could be seen from Beijing’s ancient monuments less than a third of the year. Nearby lakes were so contaminated2 that they couldn’t be used to water crops. And children were warned not to play outside in the noxious3 air. tSo when China applied to host the Less than a decade ago, this city was an industrial wasteland1. The sky could be seen from Beijing’s ancient monuments less than a third of the year. Nearby lakes were so contaminated2 that they couldn’t be used to water crops. And children were warned Not to play outside in the noxious3 air. tSo when China applied to host the