Noctilucent clouds mainly appear at latitudes between 50 and 70°. But with global warming, they tend to “descent” to lower latitudes. © petraboekhoff, Pixabay, CC0 Creative Commons
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Noctilucent clouds mainly appear at latitudes between 50 and 70°. But with global warming, they tend to “descent” to lower latitudes. © petraboekhoff, Pixabay, CC0 Creative Commons