Studies of past climate have allowed inferences to be made about past changes in global climate on time scales ranging from a few decades to millions of years. The uncertainties related to these conclusions on past climate generally increase with time into the past.
This information on past climate show that the overall temperatures of the last half century is unusual in at least the previous 1300 years. The last time that the climate was significantly warmer than now for an extended period (about 125,000 years ago, during the last interglacial period), reductions in polar ice volume led to 4 to 6 metres of sea level rise
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