acid rain - rain which contains large amounts of harmful chemicals as a result of burning substances such as coal and oil., climate - the general weather conditions usually found in a particular place., drought - a long period when there is little or no rain., global warming - a gradual increase in world temperatures caused by polluting gases such as carbon dioxide., renewable energy - describes a form of energy that can be produced as quickly as it is used., ozone layer - a layer of air high above the Earth, which contains a lot of ozone, and which prevents harmful ultraviolet light from the sun from reaching the Earth., waste - unwanted matter or material of any type, often that which is left after useful substances or parts have been removed.,

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