How is the unusual warming of the earth caused?
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Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people burning fossil fuels.
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Answer:The IPCC states that most of the temperature increase since the mid-20th century is likely due to human activities. Human activities contribute to global warming by increasing the greenhouse effect. The greenhouse effect happens when certain gases—known as greenhouse gases—collect in Earth's atmosphere.
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