Large dams are defined as over 15 meters tall, with over 57,000 worldwide. China has the most with over 23,000, followed by the US, India, Japan, and Brazil. While over 1000 dams were under construction in 1994, the rate of completion has declined from around 1000 per year from the 1950s to the 1970s to around 260 per year in the early 1990s. Large dams have faced significant opposition due to the huge numbers of people displaced, estimated between 40 to 80 million displaced globally, mostly in China and India, with many impoverished and suffering after being forced to relocate. Dams have also flooded over 400,000 square kilometers of land and over 13,500 people have been killed in