Webdavid keith wants to spray a pollutant into the sky to block some sunlight.

David keith leads the climate systems.

He says the benefits would outweigh the danger.

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You forget how to do.

Paulson school of engineering and applied sciences and a.

Every time something is done for you, it could cause all sorts of problems.

Webcanadian rock climber david keith is a gordon mckay professor of applied physics at harvard john a.

“the biggest enemy is convenience.

Webcalifornia state university, monterey bay

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