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3. Match the following words and phrases to their definitions: 1 deforestation -> 2+ water pollution 3- ozone layer 4- air pollution → contamination of the air with dangerous substances → protecting energy resources → animals in danger of -> disappearing → reusing rubbish to make new products endangered species + cutting down the trees dropping litter → a natural shield which protects us from the Sun's radiations recycling saving energy → leaving rubbish everywhere → throwing dangerous things into the water​