What is one way people positively affect water resources?

Our water resources face a host of serious threats, all of which are caused primarily by human activity. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth.

One of the most serious threats to water resources is the degradation of ecosystems, which often takes place through changes to landscapes such as the clearance of forests, the conversion of natural landscapes to farmland, the growth of cities, the building of roads, and surface mining. Each type of change to a landscape will have its own specific impact, usually directly on natural ecosystems and directly or indirectly on water resources.

Although it is difficult to integrate the intricacies of ecosystems into traditional assessment and management processes a holistic ecosystem approach to water management is strongly recommended

answer; i do believe its (b) 12.5 years of age;