A foszfor is szuk keresztmetszet lesz:
http://www.backyardnature.net/phosphor.htm

Ha elegetjuk a biomasszat, akkor nem tudjuk visszaforgatni a foldbe a foszfort. Peak Foszfor: 1988.

In fact, Isaac Asimov, an important science writer, has defined phosphorus as "life's bottleneck." This is true even though phosphorus is by no means the rarest mineral element. If you have a miniscule amount of something but only need a tiny, tiny bit of it, then that's less critical than if you have a fair amount of something, but you need a lot of it...

Asimov noticed that some mineral elements are more common in organism bodies than in the surrounding environment. Obviously that organism has needed to concentrate that element in itself. The degree of concentration of that element in the organism's body, then, becomes a good indication of these two things:

* how much organisms need that element
* how available it is in the environment

Asimov noted that phosphorus composes about 0.12% of an average soil, yet a much greater percentage of an alfalfa plant's body, about 0.7%, is phosphorus. Therefore, the "concentration factor" for phosphorus is about 5.8 (0.7/0.12).

No other mineral element even comes close to having a concentration factor as great as phosphorus's. The closest is sulfur with 2.0, then chlorine with 1.5. All the rest have less than a factor of 1.

Therefore, if there are more and more organisms needing mineral elements, or if the living ecosystem is more and more depleted of its resources, which mineral element will come into short supply first?

Phosphorus.