Countertops are just one of many uses for concrete in a green home. In recent years it has come into its own when used as flooring, fireplace surrounds, furniture, and even whole house construction. We have to say up front that concrete's eco-friendliness is a topic of debate as the process of making Portland cement, a major component, is not green. Environmental alternatives to Portland cement are increasingly available and some modern design factors compensate for its use. More about that later...