Around the time I was born there were 2.5 billion on this planet. Today there is around 7.5 billion and by 2025 there will be 8 billion.

Simply put we are running out of jobs available for people. We are also reaching a point where it's getting harder and harder to feed everyone. If it weren't for the amazing increases in food production started in the 1950's we'd already be seeing mass starvations worldwide. The really bad news is that we've leveled off and increases in food production science will not be able to keep up with population increases.

Natural food production for the United States was estimated to be for 250 million people .... We are over 300 million now and depend on modern fertilizers and genetic foods.

The choices are accept a certain level of a welfare state or choose a couple billion people that have to be eliminated.