[quote=@The Omnipotent Sphere]
<Snipped quote by Xilaw>

Have you read the OP? The whole goal of our character's is to prevent expansion onto other planets. 

As for technology, with advanced filtering capabilities which would likely be present in the future water will be completely recyclable (read up on the ISS' water supply). As for food, genetically modified crops have already proved to be the way of the future in the mass production of food, as long as we limited food-waste we wouldn't have a problem sustaining a larger population (American throws away 40% of its food).
[/quote]

Except the population is like over 2x the population is today. We may throw away a lot of food, and we may be able to make more, but with the amount of people, damn, food production would struggle with keeping up with the needs of people. I suspect that food shortages in poorer areas and even in some lower middle-class areas might not be unexpected or uncommon. Even the rich's feast may be equal to a middle-class meal at a restaurant that enjoys large meal portions.