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Amid the upheaval of the Covid-19 pandemic, the virus may be teaching us some unexpected lessons about how our world works.

With a dramatic decline in emissions, we might be surprised to see the clear blue sky over normally polluted cities. And as we retreat back into our homes, wildlife that is often hidden has emerged to be seen.

This kind of environmental change was vividly imagined a few years ago by Alan Weisman in his book ‘The World Without Us’.

He asked how long it would take for motorways to crumble and trees to undermine office blocks if all of a sudden humans just didn't exist. So, as our impact on the environment has dramatically (if temporarily) declined, what does he make of this unexpected effect of the pandemic?

(Photo: Mountain goats in the Welsh town of Llandudno. Credit: Getty Images)