I think there are some stories about how developing nations didn’t have to setup copper wiring all over the back country for the rural development of communication network and could just set up using cellular towers. Sometime using 10 or 15 year old tech is greener than what the west was doing at the same economic development point.
You don’t. You help them electrify with renewables as much as possible. And the car they will buy will be more efficient and burn cleaner than the car the West developed with. And the stove they will use will be more efficient. Until it becomes electric.
They are in extreme poverty because they can’t afford the fossil fuel to burn for economic development. As they develop, they might pick renewable because its cost is falling to the point it might become cheaper than burning fuel, at least for certain use cases.