Yarn Made From Plastic Bottles?!

I came across this yarn in a catalog recently. I try to be super-conscious about reducing plastic in my life - glass storage containers, reusable shopping bags - so I was thrilled to see that recycled plastic bottles were being made into yarn! It will still never biodegrade, but at least it will be sweet baby sweaters or warm hats that might get more use than bottles in a landfill. What a world.