mustafa gaadi has lived his entire life on the indus river and its tributaries. he'll never forget the night years ago when the floods came. >> our boat was tied up, but it broke loose. my wife tried to get it under control, but the force of the water pulled it out into the rushing waters. then the boat capsized, and we were fighting for our lives. my three boys knew how to swim, but my two daughters couldn't. they both drowned. reporter: nobody here calls it climate change, but the fishermen clearly sense that something has gone wrong. >> floods like that are actually unusual here. but we've had heavy flooding every year since 2010. they cause a great deal of damage. the weather has changed. the summers are much hotter. reporter: to have a safer place to sleep, mustafa recently built a hut on land. but this year's floods even reached the new shelter. he doesn't know what else he can do to protect his family. and he doesn't expect help from the authorities. not far away is kot addu, a city of about half a million. for several years, it's faced a repeated threat o