There's CO2 in them thar hills (…the cosmic rays told me)

There's CO2 in them thar hills (…the cosmic rays told me): "An international research team has been given the novel task of developing a practical means of monitoring underground stores of CO2 using none other than cosmic rays. The research hinges on the detection of the muons that occur as cosmic rays interact with the Earth's atmosphere, but which can penetrate several kilometers beneath the Earth's surface. It's thought that the approach could save significant amounts of money compared to alternative techniques."

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