nanophotonic control

(a) Schematic diagram of the radiative heat exchange among the atmosphere, the outer space, and the surfaces. (b) Measured absorptivity / emissivity. (c) Real-time temperature in thermal test. (d) Calculated annual energy-saving for anti-condensation of 10 cities in various climate zones. CREDIT by Yining Zhu, Yiwei Zhou, Bing Qin, Rui Qin, Min Qiu, and Qiang Li
The possibilities are promising for night-time radiative warming using the atmosphere