Stream regulation poses threat not only to the aquatic habitat but also to the surrounding terrestrial environment. Damming has physical, chemical and geomorphological consequences on streams and rivers by altering the natural distribution and timing of flow. Stream regulation affects primary biological productivity of ecosystems including effects on river and riparian plant life on downstream habitats. Man made reservoirs interrupt the downstream flow of organic carbon, leading to emissions of greenhouse gases such as methane and carbon dioxide that contribute to climate changes. “Dam are Unrenewable” is a discussion paper that critically analyses the benefits and impacts of the dams and suggests that the technology should be regarded as unrenewable and unsustainable. The paper recommended that the world should exploit other options to hydro electric dams, which may include wind power, solar, biomas and ocean energy system to produce electricity. For water supply, rain water harvesting, desalination of marine water and wastewater recycling are better options.