rorylawless
19 hours ago
I was braced for more doom and gloom, so I’m pleasantly surprised that one explanation is reduced pollution.
tim333
18 hours ago
Yeah, that's cool.
I was struck the other way returning to Hong Kong thirty years on which used be be clear blue skies (winter 1983) but had gone constantly grey from pollution, mostly coal from China I think (2015?). Not sure how it is now