I mean we do have a pretty good indication of a quite large impending factor which may cause a lot of them to collapse in the coming years, and which could collectively be attributed to them pretty well, especially within the last 50 years.
I mean we do have a pretty good indication of a quite large impending factor which may cause a lot of them to collapse in the coming years, and which could collectively be attributed to them pretty well, especially within the last 50 years.