Here's a simple thing you can do to help save the earth. Instead of using inexpensive, but short-lived, shower curtain liners made from vinyl or plastic, why not buy a fabric one which can be washed in a washing machine and reused for years. Most of these washable ones are made of polyester. While not a natural fiber (see http://en.wikipedia.org/wiki/Polyester) I still prefer this to the throw away variety. Because the fibers are so close together, the water is still kept in the shower, not on the floor.
What's your take on this?