Final answer:
Global warming is an increase in average temperatures around the planet. It is caused by the release of greenhouse gases and has various impacts on the environment.
Step-by-step explanation:
Global warming refers to an increase in average temperatures around the planet. It is caused by the release of greenhouse gases into the atmosphere, primarily from human activities such as burning fossil fuels. The rising temperatures lead to various impacts on the environment, such as melting ice caps, more frequent extreme weather events, and disrupted ecosystems.
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