Scientists have developed a new technique to measure greenhouse gases in the atmosphere with unprecedented accuracy. Called laser heterodyne spectroscopy, it uses lasers to measure the absorption of light from molecules in the air. This allows scientists to measure concentrations of greenhouse gases like methane and carbon dioxide with an accuracy of better than 0.1 parts per million. The technique could be used by researchers to better understand how climate change is affecting our atmosphere.

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source: Phys.org