> the real cost of the rockets is an uninhabitable Earth
I've seen more than one person here express this opinion - what about rocket launches makes you think they will render the Earth uninhabitable? They certainly aren't very clean, but the emissions they produce are dwarfed by commercial aviation and ICEs. Why all the rocket hatred?
To me, this feels more like a waste of resources just for something that is cool. It's completely useless to send people to Mars, just an expensive artistic performance.
Meanwhile life on Earth is dying, because of the human activity. Some things are difficult to change (forcing everyone to use bikes all the time would be a big problem: how do you bring food into cities without trucks?), and others seem very easy: just don't put all those resources into useless Mars, and instead try to save life on Earth.
Small note: climate is only part of the problem. The current mass extinction has nothing to do with Climate Change, but is rather due to loss of habitat. Now of course, this will add to the problem big time.
But the other thing is energy. Our entire society depends on fossil fuels, which are not only causing the climate problem, but are also limited. Planning to go to Mars in 50 years assumes that we will have enough energy to live on Earth and to launch rockets. Let's be honest: right now we don't have a replacement for fossil fuels.
We mostly have hope, based on "promising tech" oversold by startups surfing on the green economy idea. Wind/solar is growing a lot, but thanks to fossil fuels. Nuclear plants take a lot of years to get built, and in many places in the world we are more closing them than building new ones.
So it is quite likely that we will have a critical energy problem before we manage to send people to Mars. The climate/energy problem is not something that we can solve later, because we are slowly running out of time. And it feels like all the resources that we put in advanced projects like Mars could be (or even should be, at this point) put somewhere else. Because that's a lot of money and competent people. Also it goes with over-consumption: it's not that one such project in itself is too much, but rather that we should start cutting into many of those superfluous projects, to survive.
I've seen more than one person here express this opinion - what about rocket launches makes you think they will render the Earth uninhabitable? They certainly aren't very clean, but the emissions they produce are dwarfed by commercial aviation and ICEs. Why all the rocket hatred?