Iraqi activist Hajer Hadi is pictured on a boat sailing along the Tigris river in the capital Baghdad, on September 23, 2021. - The Tigris is one of Iraq's two big rivers that gave birth to the ancient empires of Sumer and Babylonia and are said to have watered the biblical Garden of Eden. Today, it is dying.Human activity and climate change have choked the once mighty stream that, with its twin the Euphrates, brought to life the civilisations of Mesopotamia thousands of years ago. (Photo by Ayman HENNA / AFP)