There are a lot of babies and children in the world already without parents. Adopt one or two. Despite what weird people like Musk say, we aren't facing a crisis because we're not having enough children. If that were the case the world would have been on the brink of collapse several billion people ago. We have too many people now. We have plenty of resources, but we're not going to use them to help the people who need help because we're - as a species - pretty evil.