Re:Have we already been visited by aliens?
by naikrovek on Thursday January 21, 2021 @01:16AM
(#25856046)
CFCs are not the only pollutants.
An alien society may produce pollutants which last a million years. Plastics can last millions of years.
Sufficient pollution could cause climate change severe enough to keep all kinds of things airborne for who knows how long. We are constantly surprised by what we learn about other worlds. It is silly to me to presume that anything we know about Earth pollution will be a given on a planet from another star system.
An alien society may produce pollutants which last a million years. Plastics can last millions of years.
Sufficient pollution could cause climate change severe enough to keep all kinds of things airborne for who knows how long. We are constantly surprised by what we learn about other worlds. It is silly to me to presume that anything we know about Earth pollution will be a given on a planet from another star system.