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Antarctica is an inhospitable place. There are no towns or cities. In fact, nobody lives there [?] (PERMANENT), except for a few [?] (SCIENCE). They work on special bases, studying the climate and the ecosystem. However, things are beginning to change now. Since the 1980s, polar tourism [?] (GROW) rapidly. Recently, [?] (POLE) cruises have become popular because of the beauty of the landscape and the wildlife, such as penguins, whales and dolphins. Cruises [?] (COST) a lot because the ships need to be very strong to break the ice. However, tourists are going on them more and more. Unfortunately, this tourism has not done any good so far. [?] (SCIENCE) studies show that the tourists are now destroying the ecosystem of the Antarctic. Many [?] (ECOLOGY) now believe that we should leave this [?] (BEAUTY) continent alone.