Banaba itself is sparsely inhabited now. There is also a non-elected representative of the Banabans on Rabi Island in Fiji. Each of the 21 inhabited islands has its own local council that takes care of daily affairs. There is one council for each inhabited island, with two exceptions: Tarawa Atoll has three councils: Betio Town Council, Teinainano Urban Council (TUC) for the rest of South Tarawa) and Eutan Tarawa Council (ETC) (for North Tarawa); and Tabiteuea has two councils. Kiribati consists of 32 atolls and one solitary island (Banaba), extending into the eastern and western hemispheres, as well as the northern and southern hemispheres. It is the only country that is situated within all four hemispheres. The groups of islands are:  Banaba (or Ocean Island) is a raised-coral island. It was once a rich source of phosphates, but was exhausted in mining before independence. The rest of the land in Kiribati consists of the sand and reef rock islets of atolls or coral islands, which rise only one or two metres above sea level. The soil is thin and calcareous. It has a low water-holding capacity and low organic matter and nutrient content—except for calcium, sodium, and magnesium. Banaba is one of the least suitable places for agriculture in the world. Kiritimati (Christmas Island) in the Line Islands is the world's largest atoll. Based on a 1995 realignment of the International Date Line, the Line Islands were the first area to enter into a new year, including year 2000. For that reason, Caroline Island has been renamed Millennium Island. The majority of Kiribati, including the capital, is not first, for example New Zealand (UTC+13 in January) has an earlier new year. According to the Pacific Regional Environment Programme (previously South Pacific Regional Environment Programme), two small uninhabited Kiribati islets, Tebua Tarawa and Abanuea, disappeared underwater in 1999. The United Nations Intergovernmental Panel on Climate Change predicts that sea levels will rise by about 50 cm (20 in) by 2100 due to global warming and a further rise would be inevitable. It is thus likely that within a century the nation's arable land will become subject to increased soil salination and will be largely submerged. The exposure of Kiribati to changes in sea levels is exacerbated by the Pacific decadal oscillation, which is a climate switch phenomenon that results in changes from periods of La Niña to periods of El Niño.