andrewtac

That doesn't make sense (above); what if everyone in those countries live on the coast. I looked on a couple searches an I saw anywhere from 40-80% of folks live by the ocean. Looking at pictures of earth from space at night, a good portion of the densely populated areas are on a coast line. Historically a good portion if not a majority of humans have lived by coast lines. I am not sure if it is still most based on a couple quick searches, but it might be. I realize all coastlines are not at sea level with cliffs and such, but most likely under 500' MSL.

Mark H. I think you are confusing lower cabin altitude with lower pressure; or at least it looks like you are using them interchangeably. Lower cabin altitude would be higher pressure relative to higher cabin altitude.

I do not see an advantage of having cabin pressure remain at sea level. It actually might be worse if you are having fluctuations; as far as effects on the body. Big swings in pressure can do bad things.