A decade ago, life cycle analysis (LCA) of oil and gas resources had little impact on policymaking. All oil is created equal was the general assumption in climate assessments. The growth of oil sands in Canada, and the US shale boom sparked interest in understanding the fundamental differences in the carbon intensity of crude oil production globally. In 2012, I worked with Professor Adam Brandt at Stanford University to build the Oil Production Greenhouse Gas Emissions Estimator (OPGEE), an open-source LCA tool that uses petroleum engineering principles to calculate the carbon intensity of oil and gas production on a field level. Since then, I have spearheaded international collaborations to advance the development of open-source LCA models and datasets to allow the carbon intensity and economic assessment of the entire global oil and gas resources. This extensive research was co-published with 50 scientists and 28 institutions in prestigious journals: Science, Nature, Nature Energy, Nature Climate Change, and Nature Communications. At Aramco, we developed a web-based interactive tool that maps the entire global oil infrastructure and estimates the product carbon intensities across different oil supply chains. This tool, namely Aramco Carbon-emissions High-resolution Inventory Estimator (ARCHIE), was instrumental in bringing our research to the broader non-technical audience and developing international climate policy. Integrating LCA results across the entire oil supply chain presents unprecedented sustainability insights that are highly valuable to stakeholders. Policymakers can regulate petroleum products in different global markets, producers can devise decarbonization strategies, refiners can make climate-conscious crude choices, and customers can choose to pay a premium for lower-carbon petroleum fuels. Scientific LCA is now instrumental in guiding the climate debate and drafting a path for the future role of hydrocarbons in a carbon-constrained world.