Okay y'all, simmah daahn nah...
Sometimes an apostrophe indicates a possessive -- if Bob owns the building, it's Bob
's building.
Other times, an apostrophe is a substitute for missing letter or letters. In that case, Bob's building might mean "Bob
is building".
For the word
its, the apostrophe is used NOT for the possessive but for the missing letter...
ie
it's = it is
whereas its = possessive.
Sorry, PMS, you had it backwards.
-- Auntie the word-geek
PS -- I think the first disaster will be economic, with job losses and state budget fiascos (at least in some big states) triggering cascading belt-tightenings. I'd put yellowstone and india/pakistan tied for second, since we already have established that

"... among the ways available in which a man can die, it is a rare and signal distinction to be killed by a leopard."
-- Raymond Dasmann