I woke up this morning and looked out my window and was saddened to see that almost every cloud in the sky was derived from a condensation trail (contrail).
Clouds trap heat below them, and also reflect sunlight back into space, and nobody knows which of these effects is dominant. However, during the night (when there is sunlight to reflect) clouds definitely warm the Earth, even high cold clouds such as these.
However, it was a beautiful dawn – and despite all anxieties about the climate, it is good to occasionally tune into the transcendent beauty around us. Have a nice day :-).