A Camera That Sees Methane

Swedish scientists have built a camera that makes methane gas visible. The tool could help researchers study greenhouses gases and answer tricky questions about climate change. It’s also good for visualizing cow farts.

Magnus Gålfalk of Linköping University explains that the camera works using infrared spectroscopy. Called “hyperspectral imaging,” the method simultaneously captures a spectrum of infrared light for every pixel in a photo. Many gases absorb infrared light, Gålfalk says, not

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