Quality thread with quality posts.
I don't think sterilisation is a solution. Someone mentioned it before but getting a licence to have kids, I feel, is a better solution. Going slightly off topic, I'd bring in restrictions on the number of children allowed per family, similar to China's one child policy because, unless we start colonising other planets in the next 100 years, which is unlikely, we humans are rapidly filling this planet up and, I believe, it won't be long before we've outstripped its capacity to support us all.