Except that in even the mid-long term (several hundred years) non-renewable energy is reasonable. (Based on estimates of Uranium and other fissile reserves)
And of course by the time that runs out, we'll have something like Planetary Resources up and running...
So while 3) might not ever happen, that does not imply 1) or 2) are the only remaining options. Proof by elimination only works if you can prove for all options, not just your preferred subset.
And of course by the time that runs out, we'll have something like Planetary Resources up and running...
So while 3) might not ever happen, that does not imply 1) or 2) are the only remaining options. Proof by elimination only works if you can prove for all options, not just your preferred subset.