One-third of the world is under lockdown as a response to the coronavirus pandemic. Air traffic is down, fewer cars are on the road, and factories are closed.
We can see wild animals roam empty streets, and nature is reclaiming urban areas.
In many places, air pollution has noticeably reduced. Experts don’t think this will last. But in the meantime, the short-term effects are pretty striking, as these before-and-after pictures show.
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