Define water pollution, point source pollution, and non-point-source pollution. Which of the two is easier to identify?

ASSIGNMENT

Define water pollution, point source pollution, and non-point-source pollution. Which of the two (point source or non-point-source) is easier to identify? Which is easier to legislate? Which currently poses the greatest threat to fresh water?

Essential Environment: The Science Behind the Stories

Define water pollution, point source pollution, and non-point-source pollution. Which of the two is easier to identify?
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