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As I prepare slides & we pack bags for Luxembourg & #AsteroidDay, something strange is appearing in skies over #NewMexico & around the world. Noctilucent clouds—shimmering wisps in twilight sky—are normally only seen on poleward side of 50°. This year they're below 35°. Why!?
NLCs are easily visible to naked eye, but were never reported before the industrial revolution had kicked into high gear. The first confirmed observations were in 1885. It's tempting to link them to fossil-fuel driven climate change but could that generate clouds 50 miles up?
Human-caused global warming causes stratospheric & mesospheric cooling, which might suggest more condensation of ice particles that make up NLCs. But colder air means crystals are also smaller, with a counterintuitive visibility reduction. earther.gizmodo.com/humans-are-mak…
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