Ever gaze up at the starry night sky? This stunning view is at risk of disappearing — unless we act now, says astrophysicist Kelsey Johnson. In this fascinating, unexpectedly funny talk, she explains how light pollution affects almost every species on earth (including us) and shares five “stupidly simple” things you can do to help solve the problem.

This talk was presented at a TED Institute event given in partnership with The Kavli Foundation, the Simons Foundation and the National Academy of Sciences. TED editors featured it among our selections on the home page.

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