Calories Calories refers to the amount of energy required to manufacture and supply of a product, material or service from raw material extraction to final disposal or removal. (The energy content also is called “virtual energy”, “embedded power” or “occult power”). The traditional concept of counting all the energy used to produce a product or service. This sum includes the extraction of raw materials of the natural environment, transportation, manufacturing, assembly, installation and finally dismantling or demolition. There are different methodologies for the energy accounting in terms of scale and scope of application of the well to produce. Some authors that support the business processes relating their methodologies oil consumption.Other types of methodologies related to the amount of energy embodied in terms of supporting sustainable development and the incorporation of renewable energy in the production process. And other ecological systems as concerns the support of the ecology and economy as a whole process. This concept used in ecological systems and life cycle of materials is intended to measure the energy cost “real” and has expanded to talk about “true” value, always from an ecological approach to the economy. Methodologies such Emergy have tried to link the energy content with other fundamental concepts, such as capacitance. For example, in physics, electronics and chemical sciences. The Building Code of the United Kingdom for the sustainable development of buildings and housing incorporates the concept. In the U.S.certified LEED-Leadership in Energy and Environmental Design standards-are widely distributed worldwide for construction and certification of “green buildings” and seek to move towards a sustainable architecture. In all these cases, seeking to minimize the environmental impact of buildings. Calories is a relatively new concept in which scientists have not yet reached a consensus on universal values by the large number of variables considered in the accounts, but most of the products on which no agreement can be compared with each other to see which has more or less energy content. The most frequently used measurement units are MJ / kg (megajoules of energy needed to make one kilogram of product), tCO2 (in tonnes of carbon dioxide created by the energy needed to make one kilogram of product).Convert to MJ tCO2 is not easy because different types of energy (oil, wind, solar, nuclear, etc.) emit different amounts of carbon dioxide, so the actual amount of carbon dioxide emitted when a product is do depend on the type of energy used in the manufacturing process. However, the Government of Australia (see link below CSIRO) gives a global average of 0.098tCO2 1GJ. This is the same as 1MJ 0.098kgCO2 98gCO2 or 1kgCO2 10.204MJ.