Environmental Issues

As the human population increases, so does the human impact on the environment. Humans often cause pollution by putting substances that cause unintended harm into air, water, or soil. Many human activities disrupt ecosystems.

figure 22-5

An ozone "hole," a region of abnormally low ozone concentration, has formed over Antarctica (pink region in image). This lets more ultraviolet light strike the Earth's surface, where it damages DNA and other molecules of life.

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