Yesterday morning, in my post on UFOs and possible aliens driving them, commenter Sandra summed it up:
Don’t know and don’t care as long as they don’t litter
Which got me to thinking: Suppose the aliens are here and are dropping their litter all over the planet. How would we recognize it?
What have you seen around the planet that can be explained by alien litter and trash? “The Communist Manifesto” comes to mind, but I’m sure there are more. What say you?

Politicians, communists, socialists,brussel sprouts.
As far as I’m concerned the people on stage, debating last night, are much more frightening than any outer space alien could ever be.
Tesla vehicles.
Asparagus
Platypii
Dem voters (why use your own stuff to destroy a planet’s ability to defend itself when they’ll do it for you?)
The streets of San Francisco.
They’re also leaving noise pollution on the radio.