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Réponse :
Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat, or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.
Before pollution arose, the air was fresh and crisp, birds flew overhead, and the clouds were pure white. Animals roamed freely and lived as one with nature. Because everyone cherished nature, towering trees and rain forests were plentiful. ... They dumped waste into the oceans, and few animals survived.