smog - a mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health, waste - an unnecessary or wrong use of money, substances, time, energy, rubbish - waste material or things that are no longer needed:, fumes - harmful or strong-smelling gases or smoke, pollution - damage caused to water, air, etc. by harmful substances or waste:, recycling - the process of collecting and changing old things, so that it can be used again:, deforestation - the cutting down of trees in a large area, global warming - a gradual increase in world temperatures caused by gases, consequence - a result of a particular action or situation, extinct - not now existing,

Think 2 Unit 6 The environment

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