#1 is good.
#2... not sure what you mean by tidal. A tsunami? Floods?
I might also either change it to "...disaster, ruining the crops..." or breaking it into two sentences, since otherwise it doesn't sound very emotional.
#3 is good, though I might stick a "the" before analysts.
#4 is good.
#5 is good.
--
Oh, a big machine with flashy lights. A big machine like that has me written all over it. Well, okay, it doesn't. But give me time... and a crayon --11th Doctor