This is very cold, as Kelvin is the absolute temperature scale. Zero K is -273 degrees Celsius (oC), so zero Celsius is 273 Kelvin. Consequently 254 K is -19oC. As global temperature is about 15oC , the calculation above concludes that global temperatures should be about 34oC lower than that actually measured.
The derivation of the formulae above is explained in the following video.
http://www.environment.gov.au/climate-change/climate-science-data/climate-science/greenhouse-effect#targetText=Greenhouse%20effect,re%2Dradiated%20by%20greenhouse%20gases.&targetText=The%20absorbed%20energy%20warms%20the%20atmosphere%20and%20the%20surface%20of%20the%20Earth.
An interesting link with accurate diagram and dubunking a dienier
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