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When industrialization began, little thought was given to its ecological effects. Raw, untreated sewage was allowed to pollute our seas and rivers. Animals were killed for profit to the point of extinction. The loss of trees through uncontrolled deforestation caused erosion and unstable climate. Acid rain was caused by the poisonous gases man set into the atmosphere. Chemicals in pesticides killed animal life. Herbicides destroyed plants. The balance of nature was disturbed.
- Evaluation: Twenty Years ago Natural Hazards Were a Major Topic of Study as People Were Seen to Be at Risk from the Environment
- The Environment
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