The field of Energy economics is broad and takes within its purview all the energy expended and accounts for the total amount of energy in the product. It also not only considers the optimization of the energy used to produce this product but also takes the consideration that the energy used and expended in the product while it is in use. This consideration and the consideration of the energy expended in the total supply chain to be able to produce this product gives the total amount of environmental impact of the product. This is a comprehensive way of looking and designing a green product.