All of the following are examples of benefits that people receive by altering the Earth’s environmental spheres, except __________.

Burning fossil fuels produces electricity, terracing a hillside helps people farm sloped land, and building a home provides shelter. Eutrophication is the excessive enrichment of water with nutrients, which can cause algal blooms and reduce oxygen for aquatic life. It is generally a harmful environmental effect, not a benefit people receive from altering Earth’s environmental spheres.

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