A few dozen acres converted to piranha ponds could take care of this problem fairly quickly.
The earth's carrying capacity is about a billion, if we also want to have wildlife. We should pick the billion smartest, and then get rid of the dishonest, criminal, perverse, etc.
At the same time we do this, we should find people who are doing good things, and encourage them to do more of them and breed more.
That's the only way out of the hole that humanity's in. If we don't change our path, doom awaits.
Most people are too cowardly to change and fear change, so they're going to complain any time someone offers a solution.