Enough with this Pollution, already. Strictly, Pollution only refers to a result of, largely, human action, which results in a resource being denied to those same human beings, through their own actions. Applying the articles criteria, we could consider the seas polluted with salt, the Arctic polluted by ice. Again, strictly, the only major pollutant, on Earth, is Oxygen, a result of life processes. No other body in the entire Solar System, has Oxygen as more than a trace gas. As for Carbon Dioxide. Pah! a mere drop in the bucket, entirely due to those same biological processes. The red dust of mars, in no more a pollutant, than is the Loess of China, the sand isles of the East Australian coast, and many other situations all over the planet.