In a recent paper, an international team of scientists proposed the human race went and mucked up the natural redistribution and recycling processes of the world's nutrient supplies. Due to the extinction of many species, and the endangerment of even more, we currently deal with a worldwide sh*t-fueled nutrient production system that operates at 6% capacity.
We can't guess how severe such a low operating capacity imposes at this point, but we can all agree this is some bulls*it.
But the good news here is we'll probably create some new nature preserves, and maybe restore some cloned mammoths.