@urlyman The biggest disaster in all this, is that the plant-nutrient output of many _billions_ of people living in cities is pre- mixed with a cocktail of relatively small amounts of disruptor medications, then has plain toxins from industry, household chemicals and road-run-off added to it, before being dumped in rivers, and ultimately the sea bed.
And the billions not living in towns and cities on mains sewerage? Much gets routed down into aquifers, via VERY SLOW anaerobic decomposition, where it is not available to plant roots and ends up poisoning wells and watercourses too.
The biggest problem is almost certainly most people's "yuck" factor, probably rightly at their own tainted muck. Dealing with it becomes a chore that capitalists just use as an opportunity to harvest some more bucks, chuckling as the few who notice or care shout it out.
And that was without even mentioning industrial "livestock".