I've definitely noticed more cloudless skies, especially in the evening, with no jet aircraft seeding high clouds that linger.
This article talks about how a small fraction of flights might cause net heat-trapping. Anyways I would think this Covid related reduction in aircraft exhaust as well as other emission sources is a significant natural experiment.
This article talks about how a small fraction of flights might cause net heat-trapping. Anyways I would think this Covid related reduction in aircraft exhaust as well as other emission sources is a significant natural experiment.

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