Infinite growth on a finite world is fundamentally unsustainable. We are blasting through tipping points and heat records daily now and the world is still fundamentally reliant on fossil fuels, despite how fast 'renewable resources' are developing.
Late stage capitalism, fascism, resource depletion and climate collapse are literally all happening right now, and ww3 is currently in the process of kicking off.
I get that people want hope, but believing in entropy defying magic that will rewrite physics and human nature and save us all from ourselves at the last second... is naive at best and actively harmful at worst.
Use solarpunk ethos to build local communities and pool resources by all means though, but maybe think twice before having kids.