Marine and Freshwater Resources: Of the different problems that we addressed facing marine and freshwater systems, which do you think is the biggest problem associated with freshwater?  Why?  Which do you think is the biggest problem associated with the marine (ocean) environment?  Why?  What can and should we be doing about these problems? textbook: Cunningham, W.P., & Cunningham M.A. (2020) Environmental Science: a global concern (15th ed.)New York, NY: McGraw Hill Education.