I don't think Katrina required people to buy seeds of any type.
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The dumbest End-of-the-World film has to be the Book of Eli.
The acting, the camerawork, the props and effects were all just fine. But the plot was the dumbest thing imaginable.
The idea was that all of society could be rebuilt with just one special book, which Denzel manages to find and decided to take to San Francisco, which is the center of civilization. If the book falls into the Bad Guy's hands. The bad guy is named Carnegie, I suppose because he lives in what was once a library.
The book , of course, is the Bible. All the holy books were destroyed by vengeful maniacs in retribution for whatever plague it was that cause the destruction of civilization. Yeah, sure.
Turns out that the Bible (all one volume, conveniently) is in braille, so Carnegie cannot read it, and therefore he dies of a wound. Apparently the Bible provides advice about healing wounds. I did not know that.
The plot is hideously full of holes and inaccuracies. Braille books take up a LOT of space: the Braille letters must be finger-sized, and you can't emboss onion skin or other fine paper and still read it as Braille. There are no one-volume Braille Bibles.
I fail to see how the Bad Guy getting hold of the Bible and using it for evil purposes would prevent civilization from being rebuilt, but we are asked to believe this as well.
The other two books that are required to restore civilization are (of course) the Torah and the Koran. I would think that the Whole Earth Catalog would have been far more useful, but then the apparent Divine protection that Eli has to enable him to transport the Bible across the continent might not have been so easy to come by. At least they should have thrown in Confuscious, Lao-Tse and Buddha with the holy book collection.
And of course, we are to assume that the same Deity that protects Eli and his Bible from all the evil people (who seem to be everyone but Eli and Carnegie's blind girlfriend) was apparently around and omnipotent as ever when the Great Cataclysm struck.
And of course, we are to believe that in a world where damned near everyone is illiterate, EVERY Bible in the whole country would be destroyed except the special and impossible one-volume Braille Bible. Yeah, sure.
The happy ending consists of knowing that thousands of King James Bibles will be printed at the Printing Press in (where else) Alcatraz.
A truly dumb plot.