I wonder how we could get more people to experience this effect... Something like what Stewart Brand did by pushing for and publicising the first whole earth picture (in part via the Whole Earth Catalog) but more for the internet age.

I was toying with an idea of a site called "Get Some Perspective" where you'd start off with a FPS view and as you scroll you gradually zoom out, eventually to the whole observable universe. You could send this link to people if they're being short-sighted, callous, etc and hopefully instill a bit of the Overview effect in them...