Because reinforced concrete consists of 40 % gravel from rivers, it is a low-cost material popular with the construction industry and ordinary house buyers. The market for steel framework buildings with low carbon emissions is small, and their cost remains high.
由於鋼筋混凝土中，有 4 成砂石盜採自河川，成本低廉，讓本地建商青睞、民眾喜愛，但卻導致二氧化碳排放量少的鋼骨構造市場小，價格也居高不下。