A Elliott

Well let's see. No oxygen on Earth it seems, except when you're driving an ATV with an internal combustion engine which requires oxygen. At high altitude there is also oxygen, but at higher altitude there is less of it, but that doesn't seem to be a problem. Apparently there have never been any major storms except for the one in the movie, which is why the lead actress never bothered to ever secure critical infastructure or protect the oh so important research. If you want people to care about the actors story have a solid base. And bad news little girl, no one is coming back because even though you might have made the change, they couldn't and they have invested in traveling to other places. So you and eventually your child will die alone.