Food, Fertilizer, and Inca Empire Conservation

In the past century, manufacturing nitrogen fertilizers with ammonia has been explosive (even literally...). Increases in crop production from manufactured fertilizers have benefited tens of millions of people. Unfortunately, this fertilizer produces tremendous waste in an inefficient process that is highly polluting; we could lower global use with alternative methods. Over 500 years ago, the Incas implemented laws to conserve their valuable guano fertilizer.