desertification - 1. the process by which land changes into desert, for example because there has been too much farming activity on it or because a lot of trees have been cut down, solar panel - 2. a device that changes energy from the sun into electricity:, tune up - 3. to make slight changes to a car before you use it, treaty - 4. a written agreement between two or more countries, drought - 5. a long period when there is no rain and people do not have enough water, devastating - 6. making someone very shocked and upset, landfill - 7. a place where waste is buried in the ground, arable - 8. suitable for or used for growing crops, carbon footprints - 9.a measurement of the amount of carbon dioxide that their activities produce, permafrost - 10. an area of land that is permanently frozen below the surface, subsidence - 11. the process by which land or buildings sink to a lower level,

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