Actuarial science has always been about managing uncertainty, but today’s actuaries face a new frontier: environmental, social, and governance (ESG) risks. If you’ve worked in insurance, pensions, or risk management, you know how much models rely on historical data. But what happens when the past is no longer a reliable guide? Climate change, social upheaval, and evolving governance standards are rewriting the rules. Crafting actuarial models for ESG risks isn’t just a technical challenge—it’s a fundamental shift in how we think about risk, value, and the long-term health of organizations.

When we think about climate change and the role it plays in our world, it’s easy to focus on the environmental headlines or policy debates. But behind the scenes, actuaries are quietly becoming some of the most important players in tackling climate risk. Their expertise in modeling, analyzing data, and managing uncertainty puts them in a unique position to help businesses, insurers, governments, and investors understand and prepare for the financial impact of climate change. This guide is about how actuaries are stepping into Environmental, Social, and Governance (ESG) roles, specifically focusing on climate risk modeling, and what that means in practical terms.