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Using sustainable aviation fuels could reduce emissions by up to 80%, scientists find
(www.manchester.ac.uk)
This is a most excellent place for technology news and articles.
Even if this was true, that wouldn't lead to less emissions but just more flights.
As we can see, every time the efficiency increases, the flight price drops, and the number of flights increases. So, it just allows us to fly more for the same amount of C02.