It's a proven fact that there have been too many humans on this planet for the last 50 or more years. Also a proven fact that, when a group of (plants or animals) become too many for their environment, bad things happen. disease or starvation. We staved off starvation because of learning intensive farming and drilling deep down to the last supplies of underground water. But now disease has hit us.
--- IIn 1950 there were 2.5 billion people on the planet. Now in 2019, there are 7.7 billion. By the end of the century the UN expects a global population of 11.2 billion.