LF OS-Climate (OS-C) is a breakthrough initiative creating a transparently governed public utility of open data and open source tools for climate-aligned finance investing, business, and regulation. This session explores the launch of a global open-source collaboration to create the most potent tool for data-driven decisions in transition strategies, investments, new technologies, and policies. We will present OS-C's comprehensive technical infrastructure and methodologies, fostering the development of open data products that address the challenges of climate transition. A critical focus will be the Data Mesh architecture, pivotal for federating diverse climate data sources and achieving Net Zero objectives. Additionally, we'll introduce a new open data product, essential for financial institutions to disclose quantitatively the degree of alignment/non-alignment to Paris goals of the $87 Trillion in sovereign bonds making up about a third of all pension fund and insurance investments globally, a vital step for the Net-Zero Asset Owner Alliance (AOA) and Glasgow Financial Alliance for Net Zero (GFANZ) members towards realigning commitments to Net Zero.