According to Gold, our quaint blue marble, sitting in the still emptiness of space, clearly looked to extraterrestrials like a high-quality place to dump garbage! As an Earthling, I take offense to that. But then again, I can only take offense to that because humans evolved out of the trash heap left behind by the Garbagians (that’s what I call them). 

So, either we did this all by ourselves, a comet crashed and gave us a boost, aliens landed and offloaded their offspring, or we’re literally just garbage.

https://globalbizarre.com/panspermia-are-we-all-aliens/