Nitrogen Cycle chart (Sam this was a toughie supposal... but I meant to answer it yesterday, haha) picture learning! chart and info from
here.

Figure 1: The nitrogen cycle. Yellow arrows indicate human sources of nitrogen to the environment. Red arrows indicate microbial transformations of nitrogen. Blue arrows indicate physical forces acting on nitrogen. And green arrows indicate natural, non-microbial processes affecting the form and fate of nitrogen.
Maybe there'd be more people destroying the planet in different, more fascinating ways. I'd say thered also be a war against them at some point, always war where resources are involved. I give you a chart because I thought about it and I still dont know, haha.
Suppose there was no drinking
age anywhere in the world. /haha/
EDIT Zandorf You missed age,
age... I could not take alcohol away from the world.