Reducing CO2 emission is a main step to fight climate change. Building constructions consume a significant amount of energy and natural resources. The energy spent on the production of the building materials is nonrenewable and has wide environmental impacts. Correct embodied energy calculation will reduce future energy use, and therefore, can lower environmental impact. Using local materials for building construction lowers CO2 emission and energy use. This research will explain what embodied energy is, why it is so important for building and construction, where it is applicable, and will compare two building materials and their embodied energy.