Pollution may be caused by natural sources or human activities, but regardless of the cause, the result is the same. It can have detrimental effects on aquatic ecosystems as well as the health of those who depend on those sources of water, like us!
review verb (THINK AGAIN) C1 [ T ] to think or talk about something again, in order to make changes to it or to make a decision about it: The committee is reviewing the current arrangement/situation. Let's review what has happened so far.
Review, criticism imply careful examination of something, formulation of a judgment, and statement of the judgment, usually in written form. A review is a survey over a whole subject or division of it, or especially an article making a critical reconsideration and summary of something written: a review of the latest book on Chaucer. A criticism is a judgment, usually in an article, either favorable or unfavorable or both: a criticism of a proposed plan.