CNN —
Climate change is impacting urban areas especially hard, and densely populated cities are suffering the most.
The urban heat island effect means that city temperatures can be several degrees higher than nearby rural regions. That’s because materials like concrete and asphalt absorb and radiate heat. Vehicles and air-conditioning units expel heat, and towering buildings block wind flow.
Officials across the globe are trying to cool cities down. In Chicago, which has a history of fatal heatwaves, more than 500 rooftops have been covered with vegetation, which releases cooling water vapor and acts
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