. >> on the road to tarawa, the capital of kiribas. because of climate change the ocean is rising. the waves pounding the shore can seriously damage it. the waves caused the courselias to erode and uproot trees. to protect themselves from the waves, locals built sea walls but they're not as effective as they once were. the village has asked the government for funding to build a higher wall. but the government doesn't have the funds. the local residents are doing their best to protect their homes by raising them. finding usable water has also become a serious challenge. arthur cuwango lives with a 13 member extended family including his wife and daughter. the rising level means sea water has started seeping into their water supply. >> it tastes more salty. it wasn't before but now it's getting more salty. >> reporter: the local people started collecting rain water in a tank for backup but the weather is unstable so sometimes there is not enough rain water. ♪ arthur has become more aware of the various ways salty water will affect their lives. >> before they were green and right now