Rising sea levels, sinking land and flooding river banks plague Jakarta, one of the world’s largest cities. Indonesia has 80,000 kilometres of coastline and 17,500 islands, making Indonesia especially vulnerable to the impacts of climate change.The Ciliwung River passes through the city of Jakarta and is 119km long. It is renowned for being one of the most heavily polluted rivers in the world and Bang Kodir and his institute are part of a monitoring program that documents changes to the river.