biodegradable

biodegradable – something which will break down over time and not be harmful to the environment

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challenge

a challenge – something hard to manage – very useful alternative to problem, issue etc..(use as adjective too – challenging)

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ice caps

ice caps – the area of ice at the north and south poles (also called polar ice caps)

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toxic waste

toxic waste – waste products (usually from industry) that are harmful to the environment

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