On: Runway melts at London Luton airport as temperatures in UK near 40°C

[Sharlin]

This is what the greenhouse effect is, literally. At "thermal IR" wavelengths the sky is a blanket. Cloudy sky is even more of a blanket.

[Scoundreller → Sharlin]

I live near a grape growing are, and they have wind turbines to blow air on cool nights slightly above freezing because the radiation from the ground to to sky can be enough to frost-damage their crops.

So they turn them on the blow the stagnant warmer ambient air around and mitigate that.