Pollution is the addition of any substance or form of energy to the environment at a rate faster than the environment can accommodate it by dispersion, breakdown, recycling, or storage in some harmless form. __________________________ Carbon dioxide, for example, is a normal component of the atmosphere and a by-product of respiration that is found in all animal tissues; yet in a concentrated form it can kill animals. Human sewage can be a useful fertilizer, but when concentrated too highly it becomes a serious pollutant, menacing health and causing the depletion of oxygen in bodies of water.
- ①A pollutant need not be harmful in itself.
- ②Some pollutants are more harmful to life than others.
- ③Pollution is now a universal problem all over the world.
- ④Pollution has accompanied mankind for millions of years.
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정답 ①
출처: 인사혁신처 공개 기출(공공데이터포털, 이용허락 제한 없음)