This bill would prohibit large financial institutions, including bank holding companies, savings banks, and their subsidiaries, from financing or investing in fossil fuel production from new sources or funding the construction of new or expanded fossil fuel infrastructure like pipelines, wells, and power plants. The legislation defines "new sources" as any fossil fuel production beyond proven reserves that existed when the law would take effect, effectively blocking banks from supporting fossil fuel expansion while potentially allowing some existing operations to continue. Financial companies would be required to maintain compliance policies, and their chief executives would need to certify adherence to these rules annually. Violations would carry significant penalties, including criminal fines up to one million dollars per day for standard violations and up to five million dollars per day for violations involving intent to deceive or defraud, plus the ability to ban individuals from future employment in banking or publicly traded companies. The bill also requires federal banking regulators to supervise compliance with these new restrictions.