Which of the following items is most sensitive to increased acidity in the environment?

Epidemic increased by humanity's abuse of environment?

• Does anyone have a good example from history (before 1950) where humans' abuse of the environment/lack of a good environment (for instance- pollution, lack of food/clean drinking water, ignorance of germs and lack of sanitation to prevent their spread, etc.) has increased the damaging effects of a pathological epidemic? (Please, DON'T say the Black Death, because that didn't particularly apply)

• Answer:

  1857- London. Cholera epidemic. John Snow MD figured it all out. The story is still taught today. http://johnsnow.matrix.msu.edu/aboutjohn.php