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In October of 2011,the world population reached:
Tight Oil
A type of unconventional oil found in shale and other low-permeability rock formations, extracted through hydraulic fracturing or "fracking."
Host Rock
The original rock formation that contains minerals, gems, or other economically valuable materials, or into which ore is introduced during hydrothermal events.
Conventional Oil
Oil that is produced through traditional drilling methods, as opposed to unconventional methods like fracking.
Net Energy Ratio
A measure comparing the amount of energy available from a resource to the amount of energy used to obtain that resource.
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