Gates indicated that we need to work on “...reproductive health services...” when talking about reducing the growth of population. “reproductive health services”, in this context, is code for ABORTION.
I think condoms, birth control, and abstinence programs are a more likely meaning in that context. He didn't say abortion, and I don't think he meant abortion.
Again, he basically concluded you couldn't stop the population growth so you need to change the sources of energy.