A cooling material

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The present invention provides a cooling material which comprises particles that are arranged for generation of surface plasmon resonances. The surface plasmon resonances have a wavelength or wavelength range within an atmospheric window wavelength range in which the atmosphere of the earth has a greatly reduced average absorption and emission compared with the average absorption and emission in an adjacent wavelength range, whereby the cooling material is arranged for emission of thermal radiation associated with the generated surface plasmon resonances and absorption of radiation from the atmosphere is greatly reduced.