One of the most damaging acts that most people do to the environment is having children. Controlling that would greatly improve the environment. While any sin

One of the most damaging acts that most people do to the environment is having children. Controlling that would greatly improve the environment. While any single person is far smaller than the scale you want enforced, you could have standards pushing for reduced population that would penalize countries that don't implement those standards or large corporations that engage in actions that promote population increases.