Well hell!?!?
I definitely want some of this on my car here in summer!
"...The amount of sunlight absorbed by the new paint is lower than the amount of energy it radiates through our atmosphere and into deep space, so
the material actually becomes cooler than its surroundings. The team plans to carry out experiments with painted tubes carrying water and hopes to create an
electricity-free refrigeration effect...
...The team calculated that if 0.5 per cent to 1 per cent of Earth’s surface was covered in this paint, for instance by coating roofs with it,
the total effect would reverse global heating to date..."
https://www.newscientist.com/article...ld-cool-homes/
"...the BaSO4 film stays more than
4.5 °C below ambient temperature or achieves an average
cooling power of 117 W/m2..."
https://pubs.acs.org/doi/10.1021/acsami.1c02368