Air pollution, when the air becomes dirty because of smoke, gases, or chemicals from cars and factories., Water pollution, when rivers, lakes, or seas become dirty because people throw waste or chemicals into them., Plastic waste, plastic that people throw away and that stays in nature for a very long time., Deforestation, when people cut down many trees in forests., Climate change, long-term changes in the Earth’s weather and temperature, mostly because of human activity., Endangered animals, animals that may disappear because there are very few of them left in the wild..

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