Flights of Fancy?

In 2019 and 2020, Airbus sold more than 1400 planes. It has now been estimated that, over their operational lifetimes, these machines will produce over 1 billion tonnes of carbon dioxide (https://www.theguardian.com/business/2021/feb/26/airbus-reveals-planes-sold-in-last-two-years-will-emit-over-1bn-tonnes-of-co2). Aviation currently generates nearly 2% of all global 'greenhouse gas' but a rapid rise in its emissions is expected, when coronavirus lockdowns are eased. As mentioned previously, fuel for aircraft is relatively untaxed and it is difficult to allocate carbon taxes for flying to particular countries (should the operators, the start locations, the countries over which they fly or the landing destinations be held to be liable?). It would be nice to have similar emissions data for the US Boeing corporation's products. Optimistic talk of 'green aviation' seems, however, just 'pie in the sky'.