Otherwise things like: Atmospheric expansion from heat could increase the drag on the moon causing it to fall on us, could be considered worst case scenario too.
People really really love thinking of all possible things that could go wrong - the more disastrous the better (see: Hollywood; black holes from the super collider; or the atmosphere igniting from nuclear tests). But the earth is rather large, it's rather resilient, it's been through a lot and it's still here and working.
Even if the fact that the earth has survived until now proved it will keep surviving forever (I'm still alive and kicking but I don't think that means I'll live forever), looking at history shows plenty of species going extinct..
Otherwise things like: Atmospheric expansion from heat could increase the drag on the moon causing it to fall on us, could be considered worst case scenario too.
People really really love thinking of all possible things that could go wrong - the more disastrous the better (see: Hollywood; black holes from the super collider; or the atmosphere igniting from nuclear tests). But the earth is rather large, it's rather resilient, it's been through a lot and it's still here and working.