Both can be used instead of petroleum-based roofing materials that absorb heat, contribute to urban "heat island" effect and degrade under the sun, which we in turn breathe. Green roofs also retain up to 75 percent of rainfall, so they reduce a city's need to fund costly end-of-pipe solutions -- which, incidentally, are often located in environmental justice communities like mine.
这些都可以用来替代石油为主的屋顶材料 后者吸收热量，造成城市的“热岛”效应，然后在太阳底下 降解成我们呼吸的空气。绿色屋顶也能留住75%的雨水 这也有助于城市减少地下管道设施的高昂支出 这些设施恰好在环境正义的社区就能看到，比如说我居住的社区