Apart from the fact that climate change is probably her "special interest" I don't think Greta Thunberg's autism is relevant to the climate change issue. Greta herself has said to listen to the experts.
While you may be an "aviation enthusiast", have you considered the necessity for such extensive travel?
People don't "need" to go on multiple foreign trips each year, before cheap airlines came along most people couldn't even afford to travel by plane even if they wanted to.
There are now people who spend hours travelling on planes just to sit around a pool drinking all day.
It's my view that with technology a lot of business travel is now no longer necessary either.
Do we "need" to travel as much, let alone travel "quickly"
Food is flown around the world, just so we can eat foods out of season, we managed to survive without it before we can again.
Keep flying, just don't claim it has no effect on the environment, it does, and don't use it as an excuse to do nothing.