There are no other metrics that are remotely commonly used to determine real international policies. Every nation on earth is in explicit competition with every other to grow faster because of this. These policies are prescriptions by capitalist countries that weren't like this before and likely wouldn't be after.
It's beyond silly to claim that capitalism doesn't require endless growth.
> It's beyond silly to claim that capitalism doesn't require endless growth.
Capitalism requires no such thing. It’s human reproduction and striving for better conditions that requires economic expansion. That doesn’t change under socialism/communism/whatever.
Finally, GDP growth does not imply anything about carbon production. Some of the biggest growth sectors going forward are entirely about clean energy.
I know you've seen my book recommendation in the thread here; it's about the incentives behind growth, and how de-growth can work and still encourage human flourishing. Rather than just reacting negatively, why not look it up?
I think you are incorrectly characterizing capitalism, and people are off-put by the inaccuracy and it's implication that property must be taken from people. Capitalism is simple: it is an economic system where the means of production are owned and controlled by private citizens and operated for profit (the definition of profit is not always making lots of money). Nothing more, nothing less. A lot of the startup and tech economy is based squarely on private ownership of the means of production (i.e. companies). GDP and the focus on GDP growth is somewhat exclusive of whatever ism your country's economy is based on.
A good example of this is agriculture. We have less of that precious Iowan topsoil than we did 100 years ago, but crop yields are higher than ever. That's what capitalism is.