Hmm...I could raise an army of super-reflex gamers, train them to be better soldiers than those that exist, and use Wikipedia to build a few nuclear ballistic missiles. World domination!
Or since you can't re-use -most- condoms, you could just remove the reproductive organs of every infant and use artificial insemination to continue the human race at a controlled rate. Scary thing? This would actually work and could be done relatively secretly.
Population growth is not an issue, but there is a related problem that exists now, whether you realize it or not. Let me break this down for you.
Standing shoulder to shoulder, you could fit every single human on earth (yes, 7B+) into an area the size of Los Angeles; and you would have room to spare. With the world's current production of processed, clean freshwater, you could quench the thirst of 27 Billion adult humans. And with the world's current vegan food production, you could fill the bellies of 15 Billion people.
So what's the problem?
First world countries.
We flush down our toilets enough clean, drinkable water every day to solve the water shortage in the world with extra left over. No, seriously. Every time you flush your toilet you waste more water than you probably drink in a day (unless you have a REALLY efficient toilet).
Lawns in England? They can survive off of rainwater. Lawns in Texas? Not so much. There goes even more water.
Dishwater.
Showers/Bathwater.
Leaving the tap running while you sud the soap on your hands.
Do I have a solution? Yeah, and it's actually one that doesn't involve giving up any of those. Go to
http://water.org and click the big button that says "DONATE". For $25 you will help save a life. To me, that's worth the cost of a new game on Steam.