<b>Key Points</b><br>* Includes an assessment at global level, then more details on impacts in various countries.<br>* Examines the social vulnerability to climate change among farmers at different scales, the linking of climate change with policy in agricultural water management, and results of water management on green-house gas emission as an effort in climate change mitigation.<br>* Adaptation measures including groundwater management, water storage, small and large scale irrigation to support agriculture and aquaculture are presented.