 Complete the following phrase:  Invented in 2009, the BSB achieves high energy efficiency and carbon reduction primarily through thermal insulation, preventing cool air from leaving indoors and hot air from coming in from outdoors when the weather is hot and vice versa when the weather is cold, and requires short construction time since parts are pre-fabricated in factories and assembled onsite. At the 2010 United Nations Climate Change Conference, President of Mexico, Felipe Calderón, called the BSB technology a practical, imaginative, creative  bold endeavor and a new revolution of worlds architectural and housing industry, which is bound to be transferred to developing countries leading to reduction in carbon emissions. BSB has also been tested to be able to resist a 9.0 magnitude earthquake and was recommended in a United Nations Environment Program report on the rebuilding of Sichuan after its 