Says @AndrewSkinner : "Sometimes it seems we are obsessed with using red and green in our maps. It’s an easy option! Red for bad, green for good … yes? But some users have difficulty differentiating between red and green. About 8% of the world’s population (overwhelmingly, but not exclusively, male), suffer from some form of color blindness, and over 99% of them have a red-green deficiency."
Check out Andy's recent blog article covering this topic: Red... Green... What?
