Here is my theory about the teleorts during the atheon fight. I think of the lush green area as bungie's past. It was thriving with life and their community flourished and nourished themselves on their products. The sandy barren area is bungie's future since the release of Destiny. Barren, dead, and forgotten. There is still time for them to have a course correction, but HoW has to be -blam!-ing amazing for that to happen.