On Fri, 13 Dec 2019 19:07:58 -0000 (UTC)
Martin Gregorie  wrote:

> The effect was attributed to the lack of jet
> contrails, which normally lower the average temp by preventing sunlight
> from reaching the ground during the day and prevent it radiating into
> space at night. Here's a summary:

 I find it very hard to believe that there's enough contrail
coverage to have that effect.

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