Climate change impacts are manifest already in different parts of the world in varying degrees and least developed countries are particularly vulnerable to these impacts. Their vulnerability is a joint product of cumulative development and adaptation deficits. Mainstreaming is consideration and integration of adaptation into development policy-making, budgeting and implementation. National level climate financing framework and its operationalization down the streams at local government tiers for financial mainstreaming and decentralization are much needed in the present context.