He also said the key to controlling population growth is to save the lives of children under 5; and the next big thing in technology is robots.
...
Gates said the key health care metric that we as a society should be trying to improve is one that is in the front of his mind all the time–the number of children who die before age 5. Today, he said the number is 8.5 million; in 1960 it was 20 million.
...
Gates told the audience that there is no such thing as a healthy, high-population growth country. “If you’re healthy, you’re low-population growth,” he said.
While most of us assume that saving the lives of children will contribute to overpopulation, Gates said the contrary is true.
“The key thing, the most important fact that people should know and make sure other people know: As you save children under 5, that is the thing that reduces population growth. That sounds paradoxal. The fact is that within a decade of improving health outcomes, parents decide to have less children.