, caused by agricultural runoff rich in fertilizers. This process leads to excessive algae growth, which depletes oxygen levels in the water, killing fish and other aquatic life. The text states that over 40% of the world’s lakes are now affected by this problem. If you need specific answers (e.g., True/False/Not Given, matching headings, or sentence completion ), please share the actual question set, and I can provide the exact answers.

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