Are diamonds Earth’s best friend? Gem dust could cool the planet

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By Hannah Richter, Science. 

Excerpt: ...proposals to cool the planet through “geoengineering” tend to be controversial. ...In a modeling study published this month in Geophysical Research Letters, scientists report that shooting 5 million tons of diamond dust into the stratosphere each year could cool the planet by 1.6ºC—enough to stave off the worst consequences of global warming. The scheme wouldn’t be cheap, however: experts estimate it would cost nearly $200 trillion over the remainder of this century—far more than traditional proposals to use sulfur particles.... 

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