Simple, education. Dont get pregnant if you dont want to. Use condoms, pills, etc to prevent pregnancy (naturally condoms are best regarding STD prevention). Give the general public information about this item and make the best of your own enviroment. If you give people the chance of living a long and fruitfull life (culture, education, health, finance) they start thinking about the long term effects of choices. As a pleasant side effect you will see a lower rate of abortions.