The document summarizes a session on tracking biodiversity expenditures and effective budgeting. It discusses several methodologies and initiatives for assessing and tracking biodiversity expenditures, including environmental protection expenditure accounts from Eurostat and OECD, the BIOFIN methodology for biodiversity expenditure reviews, and the OECD Paris Collaborative on Green Budgeting. The BIOFIN methodology is presented in more detail, outlining its step-by-step process for defining parameters, assessing available data, analyzing and classifying expenditures, collecting data, and projecting future expenditures. International frameworks and classification systems are also discussed.