Not the large number of humans is the problem, the problem is the large number of humans related to planet's limited resources. If the population will increase much further there would be a total hazard. Every bug is important because it can feed a bird which you might eat. If the bug will be no more, your food choices will become more limited and that shortens people's life span and damages our health.

And what the fuck, this shit can easily be avoided if every married family wouldn't have more than one child for a few generations (related to the ratio they are encountered, twins and triplets wouldn't be a problem). We don't have to start killing ourselves...

The nature itself is trying to lower our numbers, that's the reason fertility decreased alot in just 50 years and also the invention of internet has a great part because it creates virgins!

TL;DR Spend your whole life in front of the PC and never get laid or go out, get married and don't make more than one kid or just adopt one.