Renewable refers to those things that are generally produced with the help of nature. One of the things that was an eye opener to me was that our world, much like the power lines that brings the power, is part of our infrastructure. It’s key to our long term livelihood on this planet. And renewable things are those that can be replenished. And it ties in to sustainability. Generally, renewable, when it comes to building materials, which I’m real familiar with, are those things that can be replaced in 10 years or less.