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Cities are epicentres of the COVID-19 pandemic. From Wuhan to Madrid to São Paulo, the scenes have been grim — wards bursting with patients, queues of refrigerated lorries acting as temporary mortuaries, food-bank lines snaking around empty streets. At the same time, people and animals have thronged streets and parks, while carbon emissions and smog levels have plummeted from New Mexico to Delhi.
COVID-19 is still running its course. The immediate aftershocks — job losses, poverty, food scarcity — need addressing urgently. But much has been learnt. The experience is already motivating change.

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