Earth - The planet on which we live; the world., Urbanization - The process of making an area more urban., Deforestation - The action of clearing a wide area of trees., Flooding - An overflow of a large amount of water beyond its normal limits, especially over what is normally dry land., Drought - A prolonged period of abnormally low rainfall, leading to a shortage of water., Overharvesting - Excessive harvesting, (of a population of animals, an ecosystem, etc.); unsustainable exploitation,

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