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关键词：climate change
Climate change refers to the long-term changes in Earth's climate, including temperature, precipitation, and weather patterns. It is largely caused by human activities such as burning fossil fuels and deforestation, which increase the concentrations of greenhouse gases in the atmosphere. As a result, we are seeing more extreme weather events, rising sea levels, and melting of glaciers and ice caps. Addressing climate change is one of the most pressing challenges facing our planet today.