There isn't plenty for everyone. Excess humanity has spilled into the natural world. Birds, insects, mammals, the fish in the sea ... we're killing it all off. There are too many of us, and it's GOOD that fewer people are mindlessly having kids. Only those of us who really, really want kids and are prepared to dedicate ourselves to raising our children well should have them -- and then, people should use common sense and limit the size of their families.