Enrique do you really think it is possible, or acceptable to not have aerospace?
I would say this is a hallmark of modern civilisation.
Aerospace enables transport of vital rapid perishables that we never had access to in the North, before aerospace, things that grow in abundance in the sunnier places, virtually not at all in others.
Currently we get those by what has to be recognised as colonial means, but it doesn't need to be that way.
And travel. Would you really still be happy in a world that would take you weeks to travel between the US and Spain?
This is why I say hydrogen has to be part of the solution.
It's the only way we'll keep planes in the air without fossil fuels.
You might have hopes that somehow batteries will develop power to weight ratio sufficient to do this, encouraged by stories of limited demos of battery powered airflights.
But the very best we can manage right now is a two seater flight, no cargo, for about seventy miles.
Personally I think this is close to the best we will ever see, batteries have a physical nature of much higher mass per Joule of energy stored than fuels.
Hydrogen by contrast, and by nature has the lowest possible mass per mole, and per Joule of any physical energy storage Medium.
Therefore it has the potential to do everything we've seen by fossil fuels, and much more.
Hence why we are likely to not only see the same modern commercial aircraft as most off us have got used to, but also the return of some classic icons that we already lost before most of us got to appreciate actually travelling in, Concorde for example.
The Rolls Royce Olympus Engines from Concorde are still in service, installed in some of the latest ships output from UK shipyards.
And Rolls Royce have tested modern engines to work with hydrogen, and all looks good.
So it doesn't seem out of the question we could see something like Concorde back in service in a very short time, if we just made the right adjustments to economy, to align with making hydrogen more financially viable.
Imagine routine flights between Spain and US, of four hours or less, again.
If we see human beneficial technical capability which is prevented by economics, shouldn't it be the economics we question, rather than the technical capability?
There is a near perfect solution to all of this, which will be had, sooner or later, because nature appears to be forcing it.
It will happen as soon as we start issuing solar indexed stimulus.
Until then, I think we will be stuck in the rut of energy extraction, not just fossil fuels, but all energy extraction, come hell or flooding, or death, probably all three, much sooner than most can imagine, and on route we will watch all value disappearing from money, because actually energy is disappearing from it, since use of energy donated to us per Joule ramps up, money issued as debt can't represent it, so money has to come to represent nothing, until it is issued the same way as the energy is issued, for free, nothing asked in return.
This is the unavoidable physical truth, that it looks like those most invested in the old system of all things for profit will be the last to accept, that the days of being able to wield privelige and power by capital are coming to an end.
Its painful knowing this and seeing all things resulting from it, including the war and death going on.
But one way or another nature will win this one.
We go with it and enjoy massive wealth, nobody left out, or continue to go against it and have something like hell, nobody left out.
We'll never even understand this as long as we are still talking about renewables.
We need to understand the fundamental difference between mathematically positive and negative energies.
Science has to accept this.
One creates, the other destroys.
Everything we do with the one that creates, is creation. Everything we do with the one that destroys is destruction.
We can't have both, it's one or the other.
This is all described by The Energy Polarity Multiplier Framework.
Science has to come to understand it and recognise it.
Its been omitted, I don't know why, all I know is we will never have understanding without it, and without understanding we will never have a solution - the only solution, that will enable us to move on to beneficial things we can barely imagine in the old system.