Aren't we nearing--or even surpassing--90 percent efficiency in most relevant areas? Which is good, of course, but it also means we can only get
so much more efficient. But the flying thing really gets to me. Even with vastly improved efficiency, it's still the worst way to travel. Europe has an excellent rail system, and while it may not be as quick as flying, it's still pretty damn fast. Also far more comfortable IMHO. Likewise for much of Asia and Central and South America.
I can't pretend that I haven't flown when rail was a reasonable alternative. When I'm in Europe, I have to travel a lot--and often very great distances, like say, Geneva to Berlin. I always wind up flying one of those cheapo airlines with
their own special airports out in the middle of nowhere that always kinda make you feel like you've stumbled upon--or
even into--a human trafficking circuit.
Also, unfortunately, in many
developing countries, where the affluent nations often grow their corn.
Still, while meat eating may not be the primary cause for obesity, I think it's still reasonable to assume that obese people consume considerably more than the rest.
This is warming of an altogether different nature, but I often think of the incomprehensible idiocy of cities like Phoenix, Arizona. When the temperature is over 110 F/45 C for days and weeks on end, virtually every house and business is operating central air-conditioning 24/7. And, of course, that in itself results in even more heat (what some have termed
"deep warming" <<< compounding countless other contributing factors. Somehow, people are still moving to Phoenix in droves.
What I find to be conspicuously absent from efforts to mitigate the effects of climate change is any emphasis upon behavioral and lifestyle changes. Encouraging people to "fly less" and, perhaps, consume less meat is hardly the same as telling people that they need to walk or bike everywhere and be vegan. Changing human behavior on such a scale would be enormously difficult, certainly, but very few people drive drunk these days and that was once quite common.