The beginning of the end?

It's this the beginning of a post apocalyptic nightmare where in the movie the earth is full covered up and we are all suffering from no more plants growing?

https://www.telegraph.co.uk/news/2025/04/22/experiments-to-dim-the-sun-get-green-light/

I've seen a Sci fi movie like this in the past. Not sure what from memory.

Better start prepping.