1. Mandate for cellulosic biofuel limited to commercial availability until completion of comprehensive study (a) Limitation Until the Administrator of the Environmental Protection Agency submits to Congress a report on the study described in subsection (b), and notwithstanding section 211(o) of the Clean Air Act ( 42 U.S.C. 7545(o) ), the Administrator of the Environmental Protection Agency may not require, for any calendar year, that transportation fuel sold or introduced into commerce in the United States contain more than a total volume of cellulosic biofuel than the total volume of cellulosic biofuel that was commercially available for the most recent calendar year for which such total volume is known. (b) Parameters of the study The Administrator of the Environmental Protection Agency shall enter into an arrangement with the National Academies for a comprehensive study on— (1) the production capacity for cellulosic biofuel at the time of the study in gallons per year; (2) the resources needed to ensure that transportation fuel sold or introduced into commerce in the United States contains at least 16 billion gallons of cellulosic biofuel in calendar year 2022, in accordance with section 211(o) of the Clean Air Act, including— (A) the number of cellulosic ethanol facilities to be constructed; (B) the acres of land to be used; and (C) the total capital investment needed; (3) the energy produced by the combustion of 16 billion gallons of cellulosic biofuel in comparison to the energy required to produce such amount of cellulosic biofuel; (4) the environmental impacts of producing cellulosic biofuel, including the net effect on global life-cycle greenhouse gas emissions; (5) the processes being developed to produce cellulosic biofuel, including the technology needed to make cellulosic biofuel commercially viable; and (6) the economics of a cellulosic ethanol facility, including— (A) the cost of feedstock acquisition; (B) the typical facility size