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While ocean pH levels are falling (that's not really an increase in "percentage acidity") corals exhibit bleaching behavior due, primarily, to increased water temperature.
The coral reefs are getting bleached by a higher percentage acidity in the water than they can cope with, thats it and all about it.
originally posted by: CulturalResilience
Its more likely that the paints used on the signs today are of an inferior quality compared to that of the past.
originally posted by: St Udio
the dust storms also sand-blast the cars/signs/everything standing outdoors in AZ
out east, like in SC... we deal with rust and corrosion & bullet holes in those road signs instead of sunlight & UV that AZ gets
originally posted by: Sixteen
Things bleach in the sun over time usually. I agree that the paint may be of a different or lower quality. Signs in FL are bleached, too, and they will continue to bleach lighter and lighter over time as they continue to sit out in the sun. Paint physics 101.