To Help Cool a Hot Planet, the Whitest of White Coats

If you want to experiment with making your own radiative cooling coatings with easily available, safe materials and common household tools, this video is a great guide:

https://www.youtube.com/watch?v=KDRnEm-B3AI

The sensible & practical stuff is mostly in the last ~2/3 of the article.

Wouldn't silver/aluminium foil/a mirror even be better?