He says the benefits would outweigh the danger.

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

David keith leads the climate systems.

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Paulson school of engineering and applied sciences and a.

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

You forget how to do.

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

Webcalifornia state university, monterey bay

“the biggest enemy is convenience.

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