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.
One who has an equal standing with another in age, class, or rank. peer review. The evaluation of the quality of the work effort of an individual by his or her colleagues. It could involve evaluation of articles submitted for publication or the quality of medical care administered by an individual, group, or hospital.