Respuesta :
Green roofs help reduce the Urban Heat Island Effect, a condition in which urban environments absorb and trap heat.
Green roofs reduce energy costs by absorbing heat instead of attracting it and providing natural insulation for buildings.
Green roofs reduce energy costs by absorbing heat instead of attracting it and providing natural insulation for buildings.
Answer:
EXPLANATION:
They are building them because it like said in the passage, "Green roofs are beneficial, not only to the environment, but also to the cities that build them. A recent study in Toronto suggested that if 75 percent of the flat roofs were greened, the city could save $37 million a year on storm water management and energy bills.