... Look, resource constraints dont exist, as far as the economy is concerned. Putting a tonne of alluminum into a car does not remove it from the planet - atoms are infinitely recyclable, and we are nowhere in the vicinity of running out of energy - Bluntly, if you belive that solar/wind/ect energy can replace fossile fuels. And you do belive this, right? Then they can also fuel a much higher global level of energy use and (real) wealth.

The alternative is nonsensical - do you imagine that the world will succeed in replacing oil, coal and gas and then just go "Rather than pave over another 30 square kilometers of the Sahara desert, we are going to leave two billion africans in energy penury" ?

This is not a possible outcome. If renewables work, they will also work for a growing global economy at a minimum until the entire world reaches something recognizable as first world standards.

If renewables cannot deliver this result, then people who are dying at thirty due to lack of electricity will go with the 1960's tech that can, and we get a fast-breeder fission powered world.

Under no circumstances other than "We all die in global war" will the future be short on energy. And even that future will be short on energy because it is short on people, rather than due to any physical restraints.