If we go with the theory of a flat earth, my biggest concern is the ice wall. Global warming is melting the polar ice caps at an alarming rate thus intern the ice wall must be melting too. With this in mind if the ice wall were to melt would't it flood the earth out like a soup bowl? Granted no-one has ever seen it, nor does anyone know of it's mass, but if this sucker is melting we are all doomed!