Polished concrete kitchen countertop with embedded recycled glass. Is it a green material? Depends on your perspective, but it's energy efficient, holding heat and cold, components are abundant, it's incredibly durable and takes very little energy to make. Keep in mind that ENVIRONMENTALLY FRIENDLY DOESN'T ALWAYS MEAN BIODEGRADABLE. Concrete lasts a very long time, so all of the above actions/features don't need to be replaced or repeated for decades after the initial product installation.