Read the passage: 'Climate scientists warn that urban areas are experiencing rising temperatures due to the heat island effect — a phenomenon where buildings and pavement absorb and re-emit solar heat. Unlike rural areas, cities have little vegetation to provide cooling shade.' What is the MAIN idea of this passage?
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A
Cities are hotter than rural areas because of the heat island effect
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B
Vegetation is necessary for human survival
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C
Solar energy can be absorbed by buildings
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D
Scientists disagree about climate change