Dragon breath.

all those volatile petrochemicals floating in/on the water... could be a real big boom if you know what I mean.

and all the other natural wonders that people love to hate. It seems that there is a lot of stuff floating the floodwaters that have been sequestered until now. This is going to take a long time for anything to become habitable in that region.

like you see in the OP--until they find something to latch onto (probably grass in this case). yes torch them if you can.

And someone brave enough to stand there with it...

Nasty little invasive vermin need to die.