In the first two installments of “The Green Garage,” we examined two very specific topics: (1) automotive waste recycling and (2) environmental law. The focus of Part 3 in this series will be much broader and will touch on several related topics. I suppose this article could be subtitled “Environmental Shop Practices” because we will discuss what you can do to make your shop more environmentally “correct.” Among the “green” topics we will discuss are (1) products and services, (2) costs, (3) business policies and (4) marketing.