Plane Contrails Have a Surprising Effect on Global Warming

Of the varied conspiracy theories regarding contrails—you know, chemtrails—one stands out for being especially wrong: the belief that the plane-made clouds are chemicals the government is secretly spraying to battle climate change, to the peril of those on the ground. First, contrails are nothing but the incidental result of mixing hot, water-vapor-filled jet engine exhaust with cold air. Second, the government has nothing to do with them.

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