Spreading rock dust on fields could remove vast amounts of CO2 from air

It may be best near-term way to remove CO2, say scientists, but cutting fossil fuel use remains critical

Spreading rock dust on farmland could suck billions of tonnes of carbon dioxide from the air every year, according to the first detailed global analysis of the technique.

The chemical reactions that degrade the rock particles lock the greenhouse gas into carbonates within months, and some scientists say this approach may be the best near-term way of removing CO₂ from the atmosphere.