I am shocked to read about the looming crisis of worldwide famine as a result of phosphate rock depletion.
Many scientists are estimating the end of phosphate rock supply at around 70 years.
With current population growth, many are saying that we will not be able to sustain world food supply within that time frame.
A forced return to crop rotation will leave an enormous shortfall in food supply and a resulting worldwide famine - especially in developed industrial nations that have established their harvests on chemical fertiliser supply.
Phosphor is the first fertiliser element that we will deplete. Every living cell requires it. There is no technological alternative. The phosphor that we sprinkle on the land is being washed rapidly into the oceans where it is far too dilute to extract.
It seems to me that humanity must wake up and start controlling population by management - or face control by famine and war.
I invite discussion.