Too much time according to whom? There are plenty of people that exist and some number number of them are working on aviation biofuel: https://en.wikipedia.org

Too much time according to whom? There are plenty of people that exist and some number number of them are working on aviation biofuel: https://en.wikipedia.org/wiki/Aviation_biofuel https://en.wikipedia.org/wiki/Aviation_biofuel We are allowed to and often have to attack problems of efficiency from both sides – in scaling up zero carbon solutions and minimizing waste in existing solutions. But note that I said "minimizing waste". It is extremely hard to get people on board with demand destruction. The fed is having a hard time raising interest rates even though it is good for the long term. Getting people to fly less isn't as simple as telling them "no" – they'll just elect someone who will say "yes" or fly more (yes, that is a thing). _You need to provide meaningful alternatives_. Like, for example, building a train. But we've proven to be pretty bad at that, so then we go look at biofuels.