Enhanced Rock Weathering (ERW)

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Enhanced Rock Weathering (ERW) : Recently, Enhanced Rock Weathering (ERW) has gained significant global attention as a promising solution to combat climate change.

  • About ERW : involves spreading finely crushed, fast-weathering rocks (like basalt) over farmlands.

o Aims to accelerate natural carbon sequestration by speeding up the Earth's natural weathering process.

o Effectiveness of ERW: U.S. Study: Applying 50 tonnes of basalt per hectare annually could sequester up to 10.5 tonnes of CO₂ per hectare over four years.

o Additional Benefits: Improves soil health as it increases soil pH, enhances nutrient availability and supports crop productivity

o Environmental impact: May help reduce ocean acidification by preventing the flow of acidic soil runoff into water bodies.

  • Risks and Limitations: Overestimated carbon removal may lead to inaccurate carbon credits and false emissions offsets.

o Inhalation of fine basalt dust can pose respiratory risks without proper protective measures.

o Some rock types may contain toxic elements, requiring careful screening before application.



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