greenhouse effect - when heat cannot escape the atmosphere and the temperature on Earth goes up, melt - when ice turns into water, drought - a long period of time when there is no rain, ozone layer - the part of the Earth's atmosphere which protects the earth from the sun, pollution - the process of making the air, water or land worse, with chemicals e.g, flood - a large quantity of water that suddenly covers an area, global warming - the increase in the temperature on Earth, nuclear disaster - an accident with nuclear power, usually causing radioactivity, oil spil - an accident when oil comes out of its container, for example at sea,

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