WATER SHORTAGE - The lack of sufficient water resources, including a lack of access t safe water supplies, to meet water needs within a region., DESERTIFICATION - The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture., SEA LEVEL RISE - First, glaciers and ice sheets worldwide are melting and adding water to the ocean. Second, the volume of the ocean is expanding as the water warms., DROUGHTS - A period of time when an area or region experiences below-normal precipitation., FLOODS - An overflow of a large amount of water beyond its normal limits, especially over what is normally dry land., GREENHOUSE EFFECT  - A process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would normally be.,

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