; (B) the development of adaptation options to alleviate economic harm and job loss caused by ocean acidification; (C) the development of measures to help vulnerable communities or industries, with an emphasis on rural communities and businesses; and (D) the development of adaptation and management options for impacted shellfish industries. (4) Authorization of appropriations In addition to amounts made available under section 12409, there is authorized to be appropriated such sums as may be necessary to carry out this subsection. . 3. Authorization of appropriations Section 12409 of the Federal Ocean Acidification Research and Monitoring Act of 2009 ( 33 U.S.C. 3708 ) is amended— (1) in subsection (a), by striking subtitle— and all that follows through paragraph (4) and inserting the following: subtitle $30,500,000 for each of the fiscal years 2020 through 2024. ; and (2) in subsection (b), by striking subtitle— and all that follows through paragraph (4) and inserting the following: subtitle $20,000,000 for each of the fiscal years 2020 through 2024. .