SCHLIMMBESSERUNG

It’s been said that the road to hell is paved with good intentions
And regarding that statement there is no bone of contention
At times a simple helpful act can prove a sonorous exclamation
Twenty-four rabbits down under became a furry devastation
With over 600 million lagomorphs overrunning the Aussie Nation.
In America a classic schlimmbesserung was massive tree defoliation
In 1890 Boston the Gypsy Moth was thought to make a better silk cord
But a few little caterpillars was turned into a devastating tree eating horde
Sometimes leaving things alone is the right and proper thing to do
Because when it comes to messing with nature, we really don’t have a clue.

(Noun — a feeling of longing, melancholy, or nostalgia that is supposedly characteristic of the Portuguese or Brazilian temperament.)