People who don’t return their cart to the cart corral in the grocery store parking lot

In my defense, I’m half asleep, and due to lack of caffeine, didn’t notice the bit about “which could actually happen in the next 5 years.”

So with that in mind, I’ll say something about environmentally friendly raw materials for super efficient battery storage.

Star Trek-style matter replicator/recycler. Just imagine being able to empty a garbage dumpster into a bin, shut the lid, press a button, and an hour later you get stacks of industrially useful metals & materials, bolts of cloth, and sacks of fertilizer.