Rocks’ Carbon Storage Capacity Overestimated

• A study in Nature challenges the belief that underground CO2 storage is limitless.

• The study suggests that the earth can safely hold about 1,460 billion tonnes of CO2 underground.

• The researchers, from Europe, the UK, and the US, used a global map of sedimentary basins to calculate this limit.

• They ruled out areas where storage would be too risky, such as basins near earthquake zones, polar regions, and biodiversity hotspots.

• The study found that only a tenth of the previously estimated global capacity, around 11,800 billion tonnes, was suitable.

• The study also revealed that countries don’t share this capacity equally: it’s higher in Russia, the US, and Saudi Arabia, and lower in India and many European countries.

• The study also capped the maximum possible temperature reversal through storage to about 0.7º C, indicating that underground storage alone can’t fix global warming.

• The study concludes that emission cuts remain the most viable way forward, and carbon storage may not replace faster transitions to renewable energy, changes in industry, and conservation of natural carbon sinks.

Rocks carbon storage is important topic for Civil service exam (WBCS).

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