One thing that baffles me is the fact that we know fertilizers are no more effective in the long run as organic farming. By rotating crops organic farming allows the natural decomposition of different organic materials into nutrients and the land can be constantly used, where “fertilized” land may produce large crops for a few seasons but then needs to lay “fallow” for several seasons before it can be used again.
This is all well and good for farming both in the pre-industrial era and even today in some barely inhabited areas, but with the World population doubling in the near future not only will we have fewer acres to farm (even with a high crop yield there will only be a limited amount of life sustainable food available) where will the trade off be: living space or farms? Will we build 100+ story apts. as the mega cities grow? And what happens to the ice calves when even the ice cows melt? We can’t leave GW out of the equation. I really hate to sound like chicken little here but unless the Malthusian theory kicks in or we find ways to farm the sea our species will be sol.
The point I was trying to make is that artificial fertilization is NOT more productive than organic farming by crop rotation. The problem lies in single crop farming. True, fertilized land may yield large crops for a few seasons, but then must lay fallow, unproductive.