The effects of climate change on water will present some of the greatest challenges the world will face. This will be in the form of increased activity at the extremes, including droughts and extreme rain events that cause floods. It will also be characterized by greater variability, meaning more unpredictable rainfall patterns. Therefore, sustainably managing water resources will be of critical importance to ensure people across the world have access to water for their daily needs. Adaptation in this sector can take shape at a variety of levels, from households employing techniques to harvest rainwater, all the way to entire watersheds, where ecosystem based adaptation can improve the ability of natural systems to function effectively, thus securing water resources on a regional scale.