I think both problems will be solved with <less oil>. Population (of any species) is a function of available energy. Every since we humans learned to supplement our food supply using fossilised energy stores our numbers have skyrocketed. Take that energy away (hello Peak Oil) and our numbers will, inevitable fall.
If we had unlimited free energy, we'd certainly still have too many people, not to mention cooking the biosphere with the waste heat from fusion processes.
> ... cooking the biosphere with the waste heat from fusion processes
Yes!
Waste heat from thermodynamic process is something that I've never seen mentioned or discussed, only greenhouse gasses. Almost all the energy we use ends up as heat.
If we had unlimited free energy, we'd certainly still have too many people, not to mention cooking the biosphere with the waste heat from fusion processes.