Researchers are testing Enhanced Rock Weathering (ERW) in Brazil to increase cacao yields and capture atmospheric CO2. By applying crushed basalt dust to degraded soils, the process neutralizes acidity and improves nutrient availability for crops. This method offers a dual benefit of restoring rainforest biodiversity and creating a new revenue stream for smallholder farmers through the sale of carbon credits.
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Using basalt dust to fix soil acidity while pulling CO2 from the air is a solid practical approach. It is better than just planting trees and hoping for the best.
The real hurdle here is the MRV. Quantifying exactly how much rock has weathered in a fragmented rainforest is hard. Without a strict standard, those carbon credits won't fetch a premium price.
I wonder about the logistics of moving tons of crushed rock to remote smallholder farms. The carbon footprint of the transport and grinding could eat into the sequestration gains.
True, but the article mentions using basalt produced in Brazil, which helps. If they source it locally, the net gain should still be positive.
