Scientists spread crushed volcanic rock on farms to remove carbon from air

As countries race to cut greenhouse gas emissions, scientists are exploring innovative ways to remove carbon dioxide (CO₂) that is already in the atmosphere. One approach attracting growing attention involves something surprisingly simple: spreading finely crushed volcanic rock over farmland. The method, known as enhanced rock weathering (ERW), speeds up a natural geological process that has helped regulate Earth's climate for millions of years. Researchers believe this technique could not only capture atmospheric carbon but also improve soil health and crop productivity making farms a valuable ally in tackling climate change.How crushed volcanic rock removes carbon dioxideVolcanic rocks like basalt tend to react naturally with rainwater over thousands of years. Rainwater picks up carbon dioxide in the atmosphere and soil to create a weak carbonic acid. Upon exposure to rocks rich in silicates, the chemicals interact to break down the mineral content and convert carbon to bicarbonate ions.