Researchers at Cambridge University have developed a plant-based film to use for coating of buildings which has been called "passive daytime radiative cooling" (PDRC). This innovative material represents a greener and sustainable way for cooling and thus it could replace the traditional polluting air conditioners in buildings. The coating comes in a range of textures and colours and it is aesthetically nice.

There are two important requirements which should apply for it to work: it must have high solar reflectance and it must have high emissivity in infrared bands to emit heat into outer space. Only a few materials have these properties.

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