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There's more than enough food produced to feed the entire populace of our planet several times over. Nobody bothers to give the food that's in excess to those who really need it. That wouldn't be fixed by having less people and probably wouldn't get much worse by having more. It's just part of the filth that is humanity.
As for energy, there's an abundance of non-petroleum energy to get the world by for eons, even at double the population (or probably triple or greater). We don't use energy efficiently and don't explore new avenues of energy due the the political (monetary) requirements of the few. Again, this isn't something that would get better with less people, and likely wouldn't grow too much worse with more people.
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