Drought. - A long period when there is little or no rain., Flood. - To cause to fill or become covered with water, especially in a way that causes problems., Glogal warming. - A gradual increase in world temperatures caused by gases such as carbon dioxide that are collecting in the air around the earth and stopping heat escaping into space., Greenhouse effect. - An increase in the amount of carbon dioxide and other gases in the atmosphere (= mixture of gases around the earth), that is believed to be the cause of a gradual warming of the surface of the earth., Melt. - To turn from something solid into something soft or liquid., Nuclear disaster. - Being or using the power produced when the nucleus of an atom is divided or joined to another nucleus., Oil spill. - An accident in which oil has come out of a ship and caused pollution., Ozone layer. - A layer of air containing ozone high above the earth that prevents harmful ultraviolet light from the sun from reaching the earth., Pollution. - Damage caused to water, air, etc. by harmful substances or waste., Recycle. - To sort and collect rubbish in order to treat it and produce useful materials that can be used again., Save. - To stop someone or something from being killed, injured, or destroyed., Waste. - An unnecessary or wrong use of money, substances, time, energy, abilities, etc.,

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