Final answer:
Global warming is the increase in Earth's average surface temperature caused by human activities releasing greenhouse gases. It leads to numerous consequences such as rising sea levels and extreme weather events.
Step-by-step explanation:
Global warming refers to the long-term increase in Earth's average surface temperature, primarily due to human activities that release greenhouse gases into the atmosphere. These greenhouse gases, such as carbon dioxide and methane, trap heat and cause the planet to warm. The consequences of global warming include rising sea levels, more frequent and intense extreme weather events, melting ice caps, and changes in ecosystems.
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