Provide examples of how humans rely on and utilize microbes and their products

1.First, help me choose a topic that provide examples of how humans rely on and utilize microbes and their products, e.g. biogeochemical cycles, biodegradation and bioremediation, production of food/beverages, industrial products, pharmaceuticals, energy etc.

2. You will just list your proposed citations for your report and then provide a brief paragraph under each source. The paragraph will summarize what kind of info is in the source, what kind of source it is (e.g. primary research/review article/textbook etc.) and whether or not you feel it will be helpful for your paper.