The practice of capturing CO2 emissions - typically from coal-fired power plants - and sequestering it in geological formations such as depleted oil and gas fields.
The technology is yet to be successfully demonstrated at large scale power plants, and critics maintain that there are concerns about the high cost of CCS and the risks associated with the stored carbon leaking back into the atmosphere.
But advocates of CCS argue it is technically feasible to capture and store carbon dioxide in large quantities and insist its deployment is essential if emissions from coal dependent economies such as the US, China and Australia are to be reduced.
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