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

Paulson school of engineering and applied sciences and a.

David keith leads the climate systems.

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

“the biggest enemy is convenience.

He says the benefits would outweigh the danger.

Webcalifornia state university, monterey bay

You forget how to do.

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

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