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a) reduce the consumption of the globally wealthy (this includes most Americans)
b) keep the globally impoverished poor to keep their consumption low
c) add in some eugenics and stop the poor people from having more kids with the promise that one day you'll let them consume the same way you already do
You're basically proposing 3, which is asking poor people to voluntarily not have kids so one day they can have what you already have by accident of birth
In both instances they're the result of the Constitution being so old and sacrosanct that you can no longer amend it in a meaningful way. You simply change the norms, stack the courts, and you've knocked out the leg of the stool that was supposed to uphold these ideals. A modern president moving around money allocated by Congress flies in the face of the Constitution. Same with an immigration ban based on religion. But the game has changed to "us v them", and if you get enough of your team in the judiciary they'll sign off whatever you want.