Well, you already are a part of Expert Exchange just by being here. You can easily add a subject within a given topic or you can add a topic by becoming a moderator of the site or simply requesting it in a post below.
Using and being part of Expert Exchange is free and everyone is welcome to contribute as long as the content and the intention is to share knowledge and innovations within the space of sustainable construction industry and related areas. Sharing is caring.
Can I promote a commercial product or service? Yes, you can as long as you prove that your idea is sustainable through research or experience.