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Turns out all we may need to stop climate change is 139 billion gallons of super-duper white paint
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I think white roads could be a problem with snow, usually the only good way to find the road in a snowstorm is to look for the darkness, no darkness and you can't tell the road from the ground covered in snow.
Oh yeah that's a good point too. Probably not actually practical. Also the super special paint almost certainly would not take being driven on by thousands of vehicles very well.