The big economic problem is that our current system cannot function with less than 2% growth. Degrowth = crash. Which is the only reason population increases (or lack of decrease) will ever be incentivised before we get back to 3 Billion. Struggling to hang onto a no longer valid economic system. The only thing that built all of this, and keeps it going is fossil fuel. We must wake up and face the fact that even if we stop everything else and focus our remaining resources toward building out alternative energy, there is no way to even come close to replacing all of this in quantity of total energy from finite fossil fuels and definetly not in the quality and utilty of liquid fuel.
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Brown=biomass
Blue=coal
Rust=oil
Green=natural gas