The second listed challenge was to repair and add to the existing network of refineries, pipelines, generators and transmission lines. It was stated that the refining and distribution of natural gas were affected by an inefficient and inadequate infrastructure and that this issue could be remedied by 38,000 miles of new pipeline and 255,000 miles of distribution lines. The third challenge is "increasing energy supplies while protecting the environment". This section states that although renewable energy is a hope for the future, it will be many years until this energy is sufficient for the nations current needs, and therefore the requirements must be met using the available means. One of the widely disputed aspects of the proposed National Energy Policy is the how the plan suggests balancing needs for future sources of renewable energy with the immediate reliance on petroleum. In Chapter Six of the policy, titled "Nature’s Power: Increasing America’s Use of Renewable and Alternative Energy", domestic energy sources such as wind, geothermal, solar and bio-fuel are cited as necessary to stabilize and protect the United States' interests. Future energy sources such as hydrogen and fusion are also cited as long-term projects. However, the Policy also states the necessity for plans to improve and expand the current pipeline systems within the US, implying that reliance on oil and natural gas will exist for years to come. The plan then goes on to detail American interests in foreign energy resources. In a section titled "Diversity of Supply", the policy explains why diversifying dependence on foreign oil is a key factor in securing short term stability. Canada, South America and the Caribbean, Africa, Russia and Asia were all detailed as having supplies of oil that could add to the supply of resources available to US consumption. Since Barack Obama has come into presidency, there has been a dramatic increase in oil production. It was especially high in the year of 2011, which is the highest it has been since the last decade. Nonetheless, the Obama Administration has taken steps to ensure that America's need for oil would also safeguard the protection of the environment as well. Although oil production has increased, America's dependency on foreign oil has decreased. The total consumption of imported oil has decreased from 57% in 2008 to 45% in 2011, which is the lowest it has been for about 20 years. Furthermore, President Obama made certain strict guidelines in regards to standardizing fuel economy in vehicles, especially the passenger vehicles. Statistically, it proves that this would help consumers save money on fuel as well as help the environment. The Obama Administration has also finalized a new regulation that would require commercial trucks, vans and buses produced in the years 2014–2018 to be tested for national fuel economy and greenhouse gas emission standards.