The study states that the risk of death from poisoning due exposure to CO2 leaks from underground rocks is about one in 100 million.
The study was conducted on the historical data on deaths from CO2 poisoning in Italy and Sicily, where the gas seeps naturally from the ground because of volcanic activity.
The number of recorded deaths was very low and the report states that engineered gas storage underground could be safer, as it will be planned and monitored.
Carbon capture and storage (CCS) enables collection of CO2 before it can escape into the atmosphere preventing it from contributing to global warming.
The environmental groups have welcomed the research, but warned against CCS technology being considered an alternative to other energy efficiency efforts.
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