; 5 U.S.C. App.) and section 3145 of title 40, United States Code. 203. Funding The Secretary shall use funds made available to the Secretary and not otherwise obligated to carry out the program under section 201(b). III Revenue 301. Climate change obligations (a) In general Not later than 6 months after the date of the enactment of this Act, the Secretary of the Treasury or the Secretary's delegate (referred to in this title as the Secretary ) shall issue obligations under chapter 31 of title 31, United States Code (referred to in this title as climate change obligations ), the proceeds from which shall be deposited in the Fund. (b) Full faith and credit Payment of interest and principal with respect to any climate change obligation issued under this section shall be made from the general fund of the Treasury of the United States and shall be backed by the full faith and credit of the United States. (c) Exemption from local taxation All climate change obligations issued by the Secretary, and the interest on or credits with respect to such obligations, shall not be subject to taxation by any State, county, municipality, or local taxing authority. (d) Amount of climate change obligations The aggregate face amount of the climate change obligations issued annually under this section shall be $200,000,000. (e) Funding The Secretary shall use funds made available to the Secretary and not otherwise obligated to carry out the purposes of this section. 302. Promotion (a) In general The Secretary shall promote the purchase of climate change obligations through such means as are determined appropriate by the Secretary, with the amount expended for such promotion not to exceed $10,000,000 for any fiscal year during the period of fiscal years 2018 through 2022. (b) Donated advertising In addition to any advertising paid for with funds made available under subsection (c), the Secretary shall solicit and may accept the donation of advertising relating to the sale of climate change obligations. (c) Authorization of