Innovation

Harvard University Cancels Plans to Block Out the Sun

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Scientists planned to send a high-altitude helium balloon into the stratosphere where it would release fine particulate matter into the atmosphere—thereby cooling the Earth.

A bright sun set
Vlad Georgescu / Getty Images

Harvard University announced Monday that it’s canceling a solar geoengineering experiment to use particles to block sunlight high in the atmosphere in an attempt to cool the Earth.

Frank Keutsch, the principal investigator of the Stratospheric Controlled Perturbation Experiment (SCoPEx), said in

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