Follow that by banning burning of coal and oil, we also remove a significant amount of noise and air pollution.
Next we can ban any hormone-disrupting chemicals (including as plastic additives) from being used in anything that will ever touch human food or drink, or ground water.
Finally we can legaize euthanasia for anyone aged 70 or older and with a terminal health condition.
With these changes you have a human population much healthier and less reliant on expensive healthcare.