China defends plan to build world's largest dam over Brahmaputra River in Tibet; says will not affect lower reaches

China is planning to build the world's largest dam on the Brahmaputra River in Tibet. The project, estimated to cost USD 137 billion, has raised concerns among neighboring countries. China claims the dam will not affect lower riparian states, and safety issues have been addressed. The hydropower project aims to develop clean energy and respond to climate change.