When lockdown began, climate scientists were horrified at the unfolding tragedy, but also intrigued to observe what they called an “inadvertent experiment” on a global scale.

To what extent, they asked, would the Earth system respond to the steepest slowdown in human activity since the second world war?

Environmental activists put the question more succinctly: how much would it help to save the planet?

Here is another video with different point of view.

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By Morgan

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