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This Solution to Runaway Emissions Starts With Crushed Rocks

‘Enhanced rock weathering’ would also boost agricultural yields while sucking up greenhouse gases.

A tractor kicks up dust as it drives through a field in the agricultural region of El Campo de Cartagena in Los Alcazares, Spain.

A tractor kicks up dust as it drives through a field in the agricultural region of El Campo de Cartagena in Los Alcazares, Spain.

Photographer: David Ramos/Getty Images

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Crushed rocks could one day draw down billions of metric tons of carbon dioxide from the air.