Nearly ½ of flight climate impact comes from contrails, the whispy clouds that can form behind jets. 3% of flights produce 80% of contrails. By forecasting the conditions that allow them to form, and rerouting, they can be stopped for a few $ a ticket.
https://www.sustainabilitybynumbers.com/p/eliminating-contrails
https://www.sustainabilitybynumbers.com/p/eliminating-contrails

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