They got there by getting us to the point we’re at now, by burning fossil fuels and offloading many of their social ills to other regions. By all means, let’s improve education and get more money in people’s pockets. But degrowth is much more likely to be accomplished through fascism than by raising the standard of living globally in a way that preserves regional independence.
It's easy enough that the bulk of G20 countries got there sans the USofA which still struggles with public healthcare.
Of course doing something isn't as easy as sitting around doing nothing save moving a bar along and just asking.
Projection wise, for now, globally we're headed to peak and decline in population so much of this jawing is moot.