Greenwashing. Polyester is a plastic, made from petroleum. Posted on October 28, 2009 by Gerry Kirk in 1 Greenwashing. Polyester is a plastic, made from petroleum. Did you enjoy this post? Get a monthly dose of practical ideas and tips to unleash your potential.Did you enjoy this post? Get a monthly dose of practical ideas and tips to unleash your potential.Share this:TwitterFacebookLike this:Like Loading... Tags: tumblr