More people require more food and more energy, both of which need to be produced, This can only happen through economic growth and efficiency gains.
People in developing or newly industrialized countries typically don't drive SUVs or live in individual houses with HVAC.
This idea that we could solve the climate change problem entirely by restricting the amount of energy people are allowed to consume in the Western world is a misguided and quaintly privileged point of view.
For most of the rest of the world limiting growth would come down to population control and demanding people remain in abject poverty.