1.Traditional construction wall materials production and land loss   The traditional construction wall raw materials mainly come from farmland, which requires a lot of soil and large land occupation. At present, There are more than 120,000 domestic clay brick and tile enterprises predominantly in producing solid clay brick. They cover more than 0.83 million acres, and produce nearly 700 billion clay brick each year, occupying 1.4 billion m3 of soil, which is equivalent to destroy 0.2 million acres of soil field. According to the statistics, due to burned clay brick, up to 140,000 hectares of farmland have been damaged since the founding of P.R.C.  2.Traditional construction wall materials production and energy consumption   The energy consumption of clay brick production in China has averaged more than twice in the developed countries, with its architectural exterior wall insulation properties 4-5 times. Based upon the statistics, the current energy consumption of domestic c...