The Earth's oceans are going to dry up and disappear in approximately a billion years. Anyway by then there would be no human beings to mourn the loss as much of the carbon dioxide would have been used up, killing majority of the plants, which not only sustain the rest of the living world but also release the oxygen we breathe. "The Sun is getting brighter. Eventually, the temperatures will become high enough for the oceans to evaporate,' says James Kasting, professor of meteorology and geoscience at the Pennsylvania State University, USA. "If we calculated correctly, the Earth has been habitable for 4.5 billion years and only has a half billion years left,' Kasting told Reuters .