>>956882>OverpopulationMalthusian doom mongering as it has been for the past ~200 years now. Turns out humanity is pretty good at blowing past your concerns with greater innovation.
>phosphorus stocks This is another severely overblown issue that rears its ugly head. Phosphorite is abundant - and even if it wasn't, we can produce our own phosphate readily going back to guano or even humanure which has almost as much phosphorous as bird shit. Combined with nitrogen rich human urine and you have a powerful, renewable fertilizer. The problem is helminth eggs and parasites, but these are issues humans already address with the usage of both synthetic and natural fertilizers in the first place.
The real problem behind fertilizer overusage is eutrophication of lake/river resources, dead zones, cyanobacteria blooms, and BMAA + anatoxin-a leaking into aquifers/groundwater that humans draw water from, for crops and drinking. These are not problems with phosphorus in specific but problems with waste. The nitrogen and phosphorous is worthless to man in the Gulf of Mexico or your nearby algae bloom'd lake.
>climate changeThis is the only real issue behind mankind's future stability on this planet.
