White roofs can cool cities

 作者:车仆娜     |      日期:2019-03-08 04:10:02
CITIES can battle the “urban heat island” with paint. Highly reflective white roofs could cool cities by an average of 0.6 °C, according to a global simulation. Dark city surfaces like roofs and roads absorb and radiate heat, leaving cities up to 3 °C hotter than surrounding areas. A team at the US National Center for Atmospheric Research in Boulder, Colorado, combined climate models with a simulation of how temperatures are modified by city landscapes. They found that in a hypothetical world in which cities sported highly reflective white roofs,