Flood.
Jokes aside pretty much none, I have mine laminated buried under my favorite apple tree.
Do you own said tree? Some weirdo might take a fancy to it and decide to steal it during the night. Your wallet might be unearthed during the theft.
Its on my family's land, its an old tree broken by thunder in half, planted by my great grandfather. No one will ever cut it, since it gives the best green apples.