Contrails formed by aircraft can evolve into cirrus clouds indistinguishable from those formed naturally. These 'spreading contrails' may be causing more climate warming today than all the carbon dioxide emitted by aircraft since the start of aviation.
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Boucher, O. Seeing through contrails. Nature Clim Change 1, 24–25 (2011). https://doi.org/10.1038/nclimate1078
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DOI: https://doi.org/10.1038/nclimate1078
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