mid-14c., "discharge of semen other than during sex," later, "desecration, defilement" (late 14c.), from Late Latin pollutionem (nominative pollutio ) "defilement," noun of action from past participle stem of Latin polluere "to soil, defile, contaminate," from por- "before" + -luere "smear," from PIE root *leu- "dirt; make dirty" (cf. Latin lutum "mud, mire, clay," lues "filth;" Greek lyma "filth, dirt, disgrace," lymax "rubbish, refuse;" Old Irish loth "mud, dirt;" Lithuanian lutynas "pool, puddle"). Sense of "contamination of the environment" first recorded , but not common until .
Just a note to Anti-Commie – these images may not have been Photoshopped. I studied photography in college for a couple of years, and it doesn’t matter whether you are using film or digital, nearly all high quality images are “manipulated” for contrast and exposure, intensity or lack or intensity in the photograph’s colours. I did colour negative printing as well as black and white, and colouration can be manipulated/altered printing “traditional style” colour prints. This kind of image manipulation went in on colour magazines for years prior to the invention of Photoshop.