> Will you call all of those people myopic for pursuing a richer life, as well?

Definitely. People living in the US are not the most happy on Earth. Life is not the easiest there. Granted, there is a very successful propaganda at work convincing people that they will have a better chance to succeed. But more and more, this ideal is being questioned.

> Bring in the big earthmoving equipment, run the concrete plans, all powered by fossil fuels, and build dams.

To continue speaking in your language, run the cost analysis. Find how much more costly it will be to entertain grandiose project just to continue living the same way as before.

Don't get me wrong, I am not a believer of an idealistic natural world where humans should not life, far from it. But as the current pinnacle of life, the greatest achievement on Earth, I consider that it is our duty to sustain ourselves for as long as possible -- and that means for now understanding as much as possible of the biological systems on Earth before changing anything. We should reduce ecological collapses as much as possible, until we have learned everything we can from the species we are disappearing every days. We must be aware of our impact, in the fullest of sense and decide with total knowledge how to proceed.

> We'll adapt, or at least I will.

You are describing the exact inverse of 'adapting'. You want to modify the environment as much as necessary, at any cost, for it to fit our current cultural zeitgeist. Our biology trumps any current cultural fact. We should not try to preserve a single society or human colony, we should try to preserve as much life and (DNA) diversity as possible, as this is our best chance to learn and understand more, and find better ways to live, to further reduce our suffering.

> Eh. This gets repeated over and over with little evidence.

This is already happening, these last years have already shown a prelude of what is to come.

Rains will be rarer and more intense, leading to periods of drought and floods, as well as reduced retention in our current biomes. I don't know what you watched these last two years but it has already been happening in several regions, I don't know what more evidence you want of what is to come.

It will only become more and more difficult to grow food and keep livestock as the water system become more violent and unstable. Trying to stabilize an increasingly unstable system will prove extremely costly, you will be battling forces that are currently outside our capabilities. You might be optimistic and consider that we will always find solutions to it, but this is unreasonable. No one has shown so far that we will be capable of containing those issues.

Water might be the most problematic issue in the medium term, but wildfires, ocean acidification, tropical storms, ecological collapses have also started to happen, more frequently and more intensely. It will lead to a harder life for everyone. We will be lucky in the US and EU and will live better life for a time, but we will also experience greatly increased migrations, that will completely destroy our current social support systems. Given the latest rise in populism (on the left and right), it is clear to me that in that situation people will vote for any tyrant that will promise to do anything to protect their way of life. That will mean building critical infrastructure to attempt to contain the effects in the best case, but more likely just more self-serving, corrupt assholes and brutal power enforcement, genocide of the millions of people moving. It's only human nature.

Frankly what you describe will only accelerate our downfall. Our best chance of surviving is through knowledge, and your way will make so much of the complexity of life around us disappear, just to fit some myopic conception of how we should live.