You'd be lucky to cover 1% of the United States, much less 1% of the world. The real world impact of everyone in the US putting this on their roof would be minimal, and you're unlikely to actually get a significant percentage to switch anytime soon.
If you're looking for solutions to global warming, look elsewhere. However, that won't stop the marketing team from selling it as such. Evaluate this technology on its merits and take the IR radiation reflection as a bonus.
I guess my question here is: what's the lifecycle impact of producing this, and is the benefit zero or greater. Fair enough, covering 1% of the US land area would be a big ask, but a .1% positive impact on the climate is non-zero, and provided they're not looking for tax-incentives that could be spent on better things, it could well do no harm.
If you're looking for solutions to global warming, look elsewhere. However, that won't stop the marketing team from selling it as such. Evaluate this technology on its merits and take the IR radiation reflection as a bonus.