Along with higher population comes higher demand for automobiles, power plants, water, and all the little shit people don't recycle and throw out their car windows like jackasses. Paper cups, cans, cigarette butts, plastic bags. And you know when all these kids grow up with wi-fi connections and ipods and everything done with the push of a button, they aren't going to give a shit about taking the time not to litter and to conserve resources.