This Selected Issues paper focuses on mainstreaming adaptation in Sierra Leone. The strong linkage between climate vulnerability and development calls for mainstreaming adaptation into national development agenda, while macro vulnerability requires fiscal policies to balance the needs of climate actions and debt sustainability. Enhancing the capacity to tap into external grants will be critical to fulfil the climate commitments while maintaining debt sustainability. Meanwhile, gradually adapting the existing Personal Financial Management (PFM) practices to integrate climate targets within and beyond the budget cycle will help mainstream adaptation and prioritize climate projects. Climate-related shocks have caused heavy casualties and economic losses, underlining the importance of investing in adaptation for infrastructure to reduce vulnerability. Macro-fiscal policies would benefit from being supported by frameworks that link climate risks to debt sustainability analysis. The authorities should calibrate climate costs and adaptation benefits and integrate adaptation into fiscal policies. Green PFM should gradually adapt the existing PFM practices to integrate climate targets within and beyond the budget cycle and help prioritize climate spending.