Advanced sensors that monitor extreme pressure and temperature in underground caverns used to store carbon dioxide might be on their way.

CO2 emitted from the combustion of fossil fuels has long been an environmental issue, it represents 84 percent of U.S. greenhouse gas emissions, according to a 2010 analysis by the Environmental Protection Agency. Officials see capturing CO2 emitted by industrial producers like power plants as one possible tool in the fight against climate change. The technique, called carbon capture and sequestration, pumps the captured greenhouse gas into cavities up to two kilometers below the Earth’s surface.

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