; 5 U.S.C. App.) and section 3145 of title 40, United States Code. (4) Energy Efficiency State Revolving Fund For fiscal year 2020 and each fiscal year thereafter, the labor standards specified in paragraph (3) shall apply to projects assisted in whole or in part with recycled funds, including principal repayments and interest earnings, made available by the Energy Efficiency State Revolving Fund established pursuant to subsection (e)(16)(E). (5) Emissions reductions Whenever possible, materials used for projects funded by this section shall be chosen with respect to minimizing their lifecycle emissions, as determined by the Administrator. (6) Natural infrastructure Whenever possible, projects funded by subsection (e) shall prioritize consideration of natural features and nature-based features, as defined in section 1184(a) of the Water Infrastructure Improvements for the Nation Act ( 33 U.S.C. 2289a(a) ). (i) Sunset (1) In general For any fiscal year beginning after the date on which the Secretary determines that— (A) pursuant to section 4693, the emissions of greenhouse gases from covered fuels for the most recent calendar year is equal to or less than 10 percent of the greenhouse gas emissions from covered fuels for calendar year 2017