Azamat Sarsenbaev, an activist from the Kazakh Caspian Sea city of Aqtau, is trying to bring attention to a problem that is closing in on residents of his city at the same time as their only water source recedes further into the distance.“Ten years ago we would swim around 200 meters in order to get to these rocks,” Sarsenbaev told RFE/RL’s Kazakh Service, recalling his childhood. “Now we are standing on them.”There is no doubt that the Caspian Sea -- the world’s largest enclosed body of water that is shared…