Hey, this planet comes with limits

It’s only fair to poor people to let them in on the main secret of wealthy, educated and successful people: smaller families mean larger lives. In the happiest of coincidences, the thing that brings fertility down fastest happens to be the same thing that brings down poverty: educating girls.

Illiterate women bear three times as many children as do literate women, and their children tend to stay poor. Meanwhile, each year of schooling raises women’s earning power by 10% to 20%. And when people are a little better off, they desire fewer children. Gender and justice is always a good combination.

For any pie, the biggest slices get cut at the least-crowded tables. The easiest, least expensive and most efficient way to have a bigger slice of the pie is to limit the number of guests you invite.

Most of us know that the secret to a big life is a small family. It works on a global scale, too. If you love your children, humanity and the world, you want to take the best possible care of them, not crowd them out of the house.