In Turkey, more energy is consumed than the average energy consumption in the world, environmental policies are ignored, greenhouse emission levels are high, issues related to global climate change are disregarded, agricultural land and forestry are destroyed, and the ecological footprint increased; thus, it has become an obligation to take significant precautions. Ecological and technological design of new comfortable, healthy, environment friendly, minimum carbon-consuming, self-sufficient settlements contribute to urban sustainability. In this article, selected examples from around the world are analyzed for the future of sustainable cities by putting forward ecological and technological approaches.