oil, natural gas, or coal which shall be used so as to emit greenhouse gases to the atmosphere. (h) Crude oil The term crude oil means unrefined petroleum. (i) Export The term export means to transport a product from within the jurisdiction of the United States to persons outside the United States. (j) Fluorinated greenhouse gas The term fluorinated greenhouse gas means sulfur hexafluoride (SF 6 ), nitrogen trifluoride (NF 3 ), and any fluorocarbon except for controlled substances as defined in subpart A of part 82 of title 40, Code of Federal Regulations, and substances with vapor pressures of less than 1 mm of Hg absolute at 25 degrees. With these exceptions, fluorinated greenhouse gas includes but is not limited to any hydrofluorocarbon, any perfluorocarbon, any fully fluorinated linear, branched or cyclic alkane, ether, tertiary amine or aminoether, any perfluoropolyether, and any hydrofluoropolyether. (k) Fossil fuel The term fossil fuel means coal, coal products, petroleum, petroleum products, or natural gas. (l) Full fuel cycle greenhouse gas emissions The term full fuel cycle greenhouse gas emissions means the greenhouse gas content of a covered fuel plus that covered fuel’s upstream greenhouse gas emissions. (m) Global warming potential The term global warming potential means the ratio of the time-integrated radiative forcing from the instantaneous release of one kilogram of a trace substance relative to that of one kilogram of carbon dioxide. (n) Greenhouse gas The term greenhouse gas means carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O), sulfur hexafluoride (SF 6 ), hydrofluorocarbons (HFCs), perfluorocarbon (PFCs), and other gases as defined by rule of the Administrator. (o) Greenhouse gas content The term greenhouse gas content means the amount of greenhouse gases, expressed in metric tons of CO 2 -e, which would be emitted to the atmosphere by the use of a covered fuel and shall include, nonexclusively, emissions of carbon dioxide (CO 2 ), nitrous oxide (N 2 O), methane (CH 4 ), and