Reggi55
1) USD reserves allow us to import more value than we export so it offers a better standard of life for the consumer than otherwise.
2) It allows us to have a bigger consumer market than we would otherwise have and incentive for countries to partner with us to sell their stuff to. If you've lived outside the US you know every business wants to sell their stuff here either as #1 or just after their home market.
Under those purposes it seems to have worked very well. Of course theres the risks of crashes along with it too.
That's today, given the pace China works at they could easily commit to phasing out coal by 2037 and mean it too. They've already started planning for moving on from it. It's also entirely likely they could have less coal use (excluding steel and industrial uses) than from power stations than Germany in 2037 (1 year before Germany commits to phase it out)
Just because there's a timetable for it still makes it backward (including the self-decided avoidance of Nuclear) to hang on so long.
Additionally Australia actively dismantles action amongst other countries. Your comment comes off as knowing the pond in the ocean of the problem. It also exports coal on a gigantic scale, read top of the world so other countries do her polluting.