I agree. Planes are getting big efficency improvements, but the enormous increase in flights is increasing the emissions fast. And is reasonable that those clouds has an impact as they reflect the sunlight.
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Correct. But air traffic is a multi-billion dollar business, with millions of jobs. There is no chance in hell that its voluntarily limited.
And if it would be limited, the same people who now complain about con trails would complain that their freedom to travel is taken from them.