On Thu, 14 Jan 2021 05:48:16 +0000
The Natural Philosopher  wrote:

> (iii) Its down to high flying aircraft contrails, so we should just stop
> flying.
>
> Of these the only currently  *testable* one is (iii) and when air
> transport did shut down post 911 there were in fact colder nights in the
> USA. And post Covid 19 shutdown there has been a rather cold northern
> hemisphere winter.

 I've seen comments that during the 911 flight shutdown the average
temperature over the US rose a little. I have no reason to doubt either
that observation or yours, it is just an indication of how difficult it is
to test even that hypothesis - let alone ones like "It's a mix of i and ii
proportions unknown". Personally I don't believe anything that ascribes a
single cause to a complex phenomenon because I ain't seen one yet.

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