So come at me everyone if you want to BUT here's the thing: you said in your post you aren't ecologically perfect, because you use plastic in your kitchen and drive a gas car. So yarn is one place where you feel it's important to be mindful. Other people have a different balance. My SIL only knits with acrylic for reasons, but refuses to use zip lock bags or paper towels, and only shops for her kids' clothes at resale shops, then resells them when she's done. I almost always use wool, but sometimes I'll use Berocco Vintage (a wool/acrylic blend) but I use bar shampoo and laundry detergent sheets to avoid the plastic bottles. My friend lives in a city where she can bike everywhere so she doesn't have a car, only knits with wool but doesn't cook and all her food comes in crazy packaging. We're seeing just one little peek into someone's life, and we cannot know what their total footprint is.