agosto 2013

A little understood

A little understood but critically important aspect of fossil fuel dependence is the energy used in energy production. Nike Air Max 90 Pas Cher Pour Femme Increasing energy is now required for the discovery, extraction, processing and transportation of petroleum and other energy sources. For example, during the 1930s the energy equivalent of approximately one barrel of oil was used to obtain 100 barrels of petroleum; by 2006, however,...