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> Is the calculator overestimating?

Maybe. My own calculus gives a first approximate value of 50Kg of Carbon for the same trip NY-London (approx 5570Km) in optimum conditions. The calculators forget also that sometimes tail winds can help, so is just an unsophisticated raw average.

In any case nothing prevent us to design hybrid planes to reduce the fuel consume. A turbine is just a motor so can be built in several different ways. And we could try also both things, hybrid planes and helping forests at the same time.



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