; (4) identify barriers preventing expansion of such efforts; and (5) develop recommendations with respect to such efforts. (c) Reports (1) Findings of study Not later than 1 year after the date on which the Secretary enters into an agreement for a study pursuant to subsection (a), the Secretary shall submit to the appropriate congressional committees the findings of the study. (2) Assessment Not later than 180 days after the date on which the Secretary submits the findings pursuant to paragraph (1), the Secretary, acting through the Administrator of the Federal Aviation Administration, shall submit to the appropriate congressional committees a report that contains an assessment of the findings. (d) Authorization of appropriations There is authorized to be appropriated to the Secretary to carry out this section $1,500,000. (e) Definitions In this section: (1) Appropriate congressional committees The term appropriate congressional committees means the Committee on Transportation and Infrastructure of the House of Representatives, the Committee on Commerce, Science, and Transportation of the Senate, and other congressional committees determined appropriate by the Secretary. (2) Climate change mitigation efforts The term climate change mitigation efforts means efforts, including the use of technologies, materials, processes, or practices, that contribute to the reduction of greenhouse gas emissions. VIII Miscellaneous 801. Separability If any provision of this division (including any amendment made by this division) or the application thereof to any person or circumstance is held invalid, the remainder of this division (including any amendment made by this division) and the application thereof to other persons or circumstances shall not be affected thereby. 802. Application of law Chapter 83 of title 41, United States Code, shall not apply with respect to purchases made in response to— (1) the public health emergency declared on January 31, 2020 under section 319 of the Public Health Service Act ( 42 U.S.C. 247d )