a drought - a long period when there is little or no rain, an earthquake  - a sudden violent movement of the earth's surface, a flood - to cause to fill or become covered with water, especially in a way that causes problems, a tsunami  - an extremely large wave caused by a violent movement of the earth under the sea, a typhoon - a violent wind that has a circular movement, overpopulation - the fact of a country or city, etc. having too many people for the amount of food, materials, and space available there, cyber attack - an illegal attempt to harm someone's computer system or the information on it, using the internet, loss of biodiversity - the reduction of any aspect of biological diversity, unemployment - a situation where a person actively searches for employment but is unable to find work, water scarcity  - a situation in which clean water is not easy to find or get, climate change - changes in the world's weather, in particular the fact that it is believed to be getting warmer as a result of human activity, Global health crises - pandemics and health emergencies, Wealth instability - Wealth, and therefore power, is increasingly in the hands of a few, widening the gap between the haves and the have-nots,

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