Eco-friendly architecture

Recycled materials are being used in architecture more and more, so why is it that the use of new construction materials continue to dominate the field of building construction? What is the emphasis being placed on the material being taught and how does the buildings that students are being taught in effects their way of thinking?
Recycled materials in construction can help reserve materials around the world. If the common architecture student knows this, why do they continue to design buildings with new materials? Architecture students learn about recycled materials and how to use them, but there is no emphasis on the importance of recycled materials. Teachers are not instilling the long range intelligence o...