There's nothing comfy about them. I hate most fabrics unless they're at least 80% cotton. Women don't wear yoga pants because they're comfy, they wear them cuz they want all the guys to look at them. And now that similar results are being achieved with more natural fabrics, a lot of women are making the switch.
As far as pollution goes, I would think that soaps, detergents, medications, drugs and all of the other chemicals that we pour into the oceans through sewer systems (incluying dyes from clothes themselves), as well as the solidified or water dissolved toxins from the combustion from engines of boats, airplanes, cars, and power plants, would probably do a lot more harm.
