The end of Chapter 2 in Withgott, J. and Laposata, M.
(2012). Essential Environment:
The Science Behind the Stories, 4rd edition, Benjamin
Cummings/Pearson Publishing describes the importance of each of
the Carbon, Phosphorus, Nitrogen nutrient cycles, as well as the Hydrologic
cycle, to the ecosystem in which it occurs and to humans. Choose one of the cycles and fully explain
one way in which human activity altered these ecosystems. What is the activity? What effect does the activity have on the
nutrient cycle you chose? What
environmental problems have arisen (or could arise) because of the activity's
affect on the nutrient cycle?