There are four phases in an ACV study:

a) The definition phase of the objective and the scope,

b) The inventory analysis phase,

c) The environmental impact assessment phase

d) The interpretation phase.

1.The amount of resource use ("inputs" as energy, such as the raw materials needed to manufacture it, transportation of raw materials, water or energy used) 

2.Environmental emissions ("outlets" to air, water and soil) 

3.Determine the contributions of the different stages of the life cycle of this product to the total emissions

4.Analysis of the socio-economic impact determining the Life Cycle Analysis Tools to increase the efficiency in each of the phases in the life of the product.

Natural gas due to its increasing use in recent years has forced to develop advanced techniques to optimize its transport to reach points of consumption. Briefly explain what is the gas cycle.

1.First, the process is located in the deposits, where the accumulation of gas under the earth's surface occurs.

2. Secondly, once the existence of a deposit has been detected and the necessary conditions have been verified, that is obtained. Normally, the technique of direct rotation drilling is used, transferring the perforated material to the surface through a perforating arm.

3. Thirdly, after the extraction, it is necessary to process and treat the gas so that it can be transported from the country of origin. Gas transportation can be done in the following ways:

A. In gaseous form through international pipelines.

 B. In liquid state (LNG - liquefied natural gas) in methane tankers. In this case, in order for the gas to be transported in a liquid state, it must previously pass a liquefaction process, cooling it to a temperature of -160º.

If the gas is transported through the international pipelines (case A), once it arrives in the country of destination, it is stored in underground warehouses waiting to be introduced into the national gas system.