Building Materials include any material which is used for the purpose of building or construction, whether residential or commercial in nature.  There are many categories of construction and building materials and numerous sources of natural and man-made or synthetic products that comprise these categories.  Buildings and their construction count for nearly half of all greenhouse gas emissions and energy consumed in the U.S. each year. There is a great deal of environmental concern related to construction and building materials, such as concern for the future availability of natural resources, the sustainability of certain materials, and the impact the production and use of some types of material have on the environment.  The current trend is to utilize building materials that are environmentally friendly, sustainable, and efficient.  Providers listed in this section are committed to offering environmentally friendly resources and products, whenever possible.