Thus, as an essential first step in capacity-building, it identifies the need to establish a more robust evidence base on the relationship between environmental change and migration. Third, it suggests changes to the legal and normative framework that, once in place, will provide the scaffolding for future policymaking, even if that policymaking need not take place in every country straight away. The challenges relating to establishing such a database would be significant, including the need to standardize definitions and develop internationally comparable indicators.