any other gases as identified by rule of the Administrator. (h) 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. (i) Solid biomass The term solid biomass means nonfossilized and biodegradable organic material originating from plants, animals or microorganisms, including products, byproducts, residues and waste from agriculture, forestry and related industries as well as the nonfossilized and biodegradable organic fractions of industrial and municipal wastes, but does not include gases and liquids recovered from the decomposition of nonfossilized and biodegradable organic material. (j) United States The term United States shall be treated as including each possession of the United States (including the Commonwealth of Puerto Rico and the Commonwealth of the Northern Mariana Islands). 4692. Carbon fee (a) Carbon fee There is hereby imposed a carbon fee on any covered entity’s use, sale, or transfer of any covered fuel. (b) Amount of the carbon fee The carbon fee imposed by this section is an amount equal to— (1) the greenhouse gas content of the covered fuel, multiplied by (2) the carbon fee rate. (c) Carbon fee rate For purposes of this section— (1) In general The carbon fee rate, with respect to any use, sale, or transfer during a calendar year, shall be— (A) in the case of calendar year 2020, $15, and (B) except as provided in paragraph (2), in the case of any calendar year thereafter, the carbon fee rate in effect under this subsection for the preceding calendar year, plus $15. (2) Exceptions (A) Increased carbon fee rate after missed annual emissions reduction target In the case of any year immediately following a year for which the Secretary determines under 4693(b) that the emissions of greenhouse gases from covered fuels exceeded the emissions reduction target for the previous year, paragraph (1)(B) shall be applied by substituting $30 for $15 . (B)