In article ,
"J. Clarke" wrote:

By that time they'll all be burning hydrogen anyway. Can't build a scramjet
that runs on oil. You really think that the engineers of the world are so
limited in their abilities that they will be unable to build an aircraft
that runs on anything but fossil fuels?

Take that blind optimism one step further and maybe anti-gravity will
get us all out of this. I prefer to do my speculating with parts and
pieces we have today. They need to be fine tuned and developed.

If you see nothing wrong with squandering resources, finite as they may
be, than you're part of the problem. Wishfully thinking that we'll
engineer our way out of whatever problem we create for ourselves is
irresponsible in my book. I'm not expecting you to agree.

And you're right. I should have been more specific in my suggestion of a
railroad 'coast to coast' by adding a few thousand details which may
have explained in more detail of it is that makes up a railroad. I do
believe that others may have had some idea that 'the rail road' could
even include branch lines. My feeling is that you simply like to be
contrary. Then again, I could be wrong.