Do not reproduce, encourage others to not reproduce. The 100% most effective way to reduce the human effect on the planet is to reduce the number of humans on

Do not reproduce, encourage others to not reproduce. The 100% most effective way to reduce the human effect on the planet is to reduce the number of humans on the planet. But of course if you follow that philosophy that probably just means you lose the evolutionary lottery and someone else will have plenty of children to take your kids' place.