Economics
Sources of unconventional oil will be increasingly relied upon as motor fuel for transportation purposes when conventional oil becomes "economically non-viable" due to depletion. Conventional oil sources are currently preferred due to the fact that they provide a much higher ratio of extracted energy over energy used in regards to the extraction and refining processes it undergoes. New technologies, such as Steam injection (oil industry) for oil sands deposits, are being developed to increase unconventional oil production efficiency.
Read more about this topic: Unconventional Oil
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