Comment by wavefunction

My "modest proposal" for humane population reduction is: every individual is born with the right to have one child. A couple then, can have two children, which is below the natural replacement rate of 2.1 leading to a gradual reduction in human population naturally. People who don't want to have kids or can't for whatever reason could sell their right to others who want to have more than their normal allotment while maintaining the lower-than-natural replacement rate. There are other complexities that would need to be considered and managed but it seems to me to be the most ethical way to reduce population, if that is desired.