As with international funding mechanisms, capacity - both technical and operational - remains an overarching challenge in many contexts (UNDP, 2015). A number of countries have started making headway in strengthening their investment appraisal mechanisms to integrate climate change (Box 27). Dedicated climate finance should support the strengthening of national systems and capacity for mainstreaming. The benefit-cost ratio (BCR) for a given policy is recalculated capturing the impact and associated costs of climate change.