Just a few counter points:

1. Like speculators who are suddenly convinced that cryptocurrencies are worthless because of the ongoing drop in market value, anthropomorphic global warming believers look at the fragile environmental balance in the world and conclude that, yes, we are doomed. Not so fast. There are many unknowns, and such a complex system cannot be so easily modeled that would allow us to predict with any precision. My faith in earth and human ingenuity is unshaken: that downward-trending graph you are looking at may turn up at some point. At any rate, that graph may not even be accurate. It’s indicating doomsday is at hand, but there are always other factors to consider that the calculations are not taking into account, like human ingenuity.
2. “Whatever future humans have, it will be together.” That goes without saying; I mean, it’s a logical tautology. We decry the rich, but has it ever occurred to us that the rich are rich because they are the best people organizers, best vision drivers? The rich keep us together because they provide what we all need (and that’s precisely why they are rich). If we banished the rich in nowhereland, we would have dictators like Kim Jong Un instead. Which dystopia is preferable?
3. Money is what makes all of us free. Without money, we can’t even specialize in our chosen vocations. (Imagine planting rice and then leaving your family because you have to go around the world trying to sell your harvest in an all-barter world.) Yes, I also believe that fiat money is doomed, but we have cryptocurrencies to replace all fiat money. Fiat money is territorial, but crypto money does not recognize territories. That crypto money in your digital wallet can be accepted anywhere in the world. Also, you will not have only one kind of crypto money, you will be holding several “brands” of crypto money, all competing against each other.