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Renewable energy won't work. Slightly inflammatory tone, but I, for one, wouldn't mind having a nuclear power station at the bottom for garden (in exchange for free electricity for life, for example).

From the comments: "High child mortality (e.g. 50%) has a high random deviation. So to achieve a high confidence of two surviving kids, you can't trust just having four babies, because you want better than 50/50 odds. So you have eight babies and end up with four kids on average to guarantee two.

.: High child mortality leads directly to high population growth. <- i="" math.="" simple="" that="">

Low child mortality (modern world), has little room for variation. Want two, have two, end up with two. Leads to very low growth."

Comparing the economies of English counties to African countries.