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