Desertification, Land becoming dry and unable to grow plants, Drought, A long period with little or no rain, Soil erosion, Soil being removed by wind or water, Deforestation, Cutting down too many trees, Overgrazing, Animals eating too many plants in one area, Reforestation, Planting trees again to restore land, Farming, Growing crops and raising animals, Water shortage, Not enough water for people or plants, Pollution, Harmful waste damaging the environment, Climate change, Long-term changes in Earth’s weather.

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恢復自動保存: ?