This bill directs the United States to use its voting power at major international development banks—including the World Bank, Asian Development Bank, and Inter-American Development Bank—to oppose financing for fossil fuel projects and instead promote clean energy investments. The legislation requires the Treasury Department to reduce U.S. contributions to these institutions dollar-for-dollar based on the amount they spend on new fossil fuel capacity, holding the withheld funds in escrow until the institutions stop funding such projects. Additionally, the bill prohibits all U.S. government agencies, including the Export-Import Bank and USAID, from directly or indirectly financing any fossil fuel activities abroad. The measure includes a specific mandate to phase out funding for gas-powered passenger vehicles and buses by 2031, and requires the Treasury to submit annual reports documenting fossil fuel financing by international institutions to ensure accountability.