It is very clear from many different types of proxy data that the Eemian was warmer than the Earth has been during the modern interglacial and the sea levels were also higher during the Eemian. The main methods of reconstructing past temperatures are deep sea cores that measure the oxygen isotope ratios and also ice cores. There are two methods of determining the past temperature from an ice core (49). One is to measure the ratio of heavy and light oxygen atoms in the ice and the other is to measure the ratios of heavy and light hydrogen. Since these are the two components of water there are
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