English: Passive daytime radiative cooling surfaces (PDRC) are efficient in solar reflectance and heat emittance to cool temperatures with zero energy consumption or pollution. Local application of PDRCs can replace air conditioning and mitigate urban heat island effect, while widespread application has been proposed as a solution to global warming.
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A diagram demonstrating the application of a passive daytime radiative cooling surface on an urban roof (left) versus an urban roof without application (right).