Match the words with their definitions. 1) deforestation 2) air pollution 3) global warming 4) endangered species 5) extinct animals 6) acid rain a) an increase in the Earth's average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect b) animal species which no longer exist c) precipitation containing relatively high concentrations of chemicals d) cutting down trees e) contamination of air by smoke and harmful gases f) animal species which are likely to disappear

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