






These high-altitude clouds — located roughly 50 miles above the surface, and seeded by the fine debris of disintegrating meteors, have long been considered a sort of “canary in a coal mine” for methane — an extremely potent greenhouse gas.
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These high-altitude clouds — located roughly 50 miles above the surface, and seeded by the fine debris of disintegrating meteors, have long been considered a sort of “canary in a coal mine” for methane — an extremely potent greenhouse gas.