> Do you have an example of anything that accounts for the possibility of unknown unknowns? My guess is if you do, then all it will take to debunk it is someone with a bigger imagination.

You can't enunmerate unknown unknown, but you can plan for them. Simple things like let things fail and no single point of failure have built in protections against unknown unknowns. Its hard to argue this without using Taleb's ideas, which GMO advocates don't like.