Scientists reveal how green roofs cut rooftop temperatures by 40°F

Green roofs offer a solution to urban heat by absorbing sunlight and releasing water. Vegetation shades surfaces and evapotranspiration naturally cools surrounding areas. These living roofs also manage rainwater and provide habitats for urban wildlife. Extensive and intensive systems cater to different building needs and budgets. Cities worldwide are adopting green roofs to combat rising temperatures and improve environments. Cities have a habit of storing heat. Roads, walls and rooftops absorb sunlight during the day and slowly release it back into the surroundings after sunset, leaving built-up areas warmer than nearby rural landscapes. Among these surfaces, rooftops often receive little attention despite covering large portions of urban space. A dark, exposed roof can become extremely hot during summer, adding extra strain to buildings and the people living inside them.Across many cities, an alternative is appearing above streets and neighbourhoods. Empty roof surfaces are being transformed into living spaces covered with plants, soil and carefully designed layers that help buildings cope with rising temperatures.How green roofs use plants and water to cut rooftop heat by up to ...