polluted  - to make water, land and air dirty, clean - not dirty, safe - harmless / not dangerous, dangerous - can kill or damage something or someone, recycle - to change waste materials so that they can be used again, plastic - a very common light, strong substance produced by a chemical process, climate change - the world’s weather is becoming warmer, global warming - the slow increase in the temperature of the Earth, environment - the natural world, including the land, water, air, plants and etc., ecology - the study of the environment and the way that plants, animals, and humans live together,

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