We'll see ... the technology you're relying on seems to be transportation technology ... growing food in Russia and Ukraine and transporting it to the hungry ... and the hungry aren't eating better, their having more kids ...
You should look at the demographics yourself ... instead of picking and choosing the demographer that says what you want to hear ... I'm seeing the same numbers as you, but this is really only true for the top half of nations, the ones with electric power and video cameras ... now look at the bottom half, places that doesn't have reliable power and thus no video cameras ...
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12 billion you say ... National Geographic says 15 billion so I think we're all in the same place on that ... we can hope and move towards a peaceful settlement ... most population decreases comes with calamity; war, drought, Russians ...
No, mainly technology geared towards eliminating waste. We lose almost 50% just to rotting before it gets anywhere. That includes transportation, inventory management, and storage.
I look at all the demographers that publish. I currently get Demography, the journal of Demographic Economics, and the MPIDR. All current source material.
Of them all, only the MPIDR has a doom and gloom bent. Which figure coming from the Max Planck Institute, purveyors of global warming fraud etc.