Enjoying and learning a lot from @DanielSchrag's online class about climate change: https://www.edx.org/course/climate-energy-challenge-harvardx-spu29x … Filling in many gaps in my understanding.
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Also, it sounds as though R. Keeling's work on O2 measurement was actually based on quite a bit of understanding of LIGO! It used laser interferometry. (Perhaps not so surprising: it's a hell of a delicate measurement, since O2 is ~500x as common in the atmosphere as CO2!)
