Looking at current research I would think that in the future plastic cans will hurtle across the sky, powered by more flammable but biodegradable chemicals. ;)
I think airplanes are here to stay for some time. There are few alternatives, one of them high speed rail, which has its own problems.
I was actually thinking about the absurdly high cost of high speed tracks (tens of millions per kilometer). But yeah, oceans are somewhat of a problem.
I think airplanes are here to stay for some time. There are few alternatives, one of them high speed rail, which has its own problems.