China is building a city where 40,000 trees will grow across buildings to fight the pollution choking its urban skies

China has some of the most polluted cities on the planet, and for years the usual fixes, stricter emission rules, factory shutdowns, better public transport, have only chipped away at the problem. So Italian architect Stefano Boeri decided to try something far more radical, wrapping entire buildings and eventually entire cities in trees.

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