Describe the heat island effect and mitigation strategies.

• A. Urban areas become cooler due to shade from tall buildings
• B. Urban areas become hotter due to dense built environment and reduced vegetation
• C. Urban areas become hotter due to dense built environment and reduced vegetation; mitigation includes green roofs, urban trees/canopy, reflective surfaces, water features, and permeability
• D. Heat island effect is a myth

Answer: (C)

The heat island effect describes urban areas becoming hotter than surrounding rural areas because of the dense built environment and reduced vegetation. Dark, heat-absorbing surfaces like asphalt and concrete store and radiate heat, while limited green space reduces cooling through evapotranspiration and shade. The compact street canyons and little airflow in cities trap heat, making temperatures rise, especially in the hottest part of the day and at night.

Mitigation strategies aim to counter these processes: adding vegetation through green roofs and a continuous urban tree canopy provides shade and cooling via evapotranspiration; using reflective or light-colored surfaces reduces heat absorption; incorporating water features can provide evaporative cooling; and employing permeable pavements helps with infiltration and can lower surface temperatures. This combination directly addresses both what causes urban heat to intensify and how to lessen it, making it the most complete description. The other statements either describe only part of the phenomenon or deny its existence.