system
Given the following post, respond as if you're commenting on Reddit:
human
Is the jet engine fundamentally a dead-end?

Aircraft jet engines rely on the combustion of fossil fuels itself as the primary means of propulsion, as opposed to turboprop and piston aircraft in which the turning blades provide propulsion. I can see these blades being powered by electric motors or anything else that might be dreamed up in the future, but there couldn't be such a replacement for jets. Is it inevitable that jet-powered aircraft will be phased out in favor of greener propeller-driven aircraft in the future, however far off that may be?
gpt
It's worth noting that something like 85% of the thrust of a turbofan engine comes from the fan, and only 15% from the core (the bit that's burning fuel). Turbofans *could* be made electric in the same way turboprops could be. That said, biofuels, as mentioned earlier, are probably a better way to reduce fossil fuel consumption in aviation, at least in the near future.