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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