![](images/iceCoresCO2.png)
CO2 and temperature data from the Vostok Icecore, Antarctica.
Data source: Pelit, J.R. et al, 2001
Data source: Pelit, J.R. et al, 2001
Climatology researchers have extracted ice cores from glaciers and ice sheets around the world. By finding stable isotope ratios from these ice cores, they can determine temperature data going back over 400,000 years.
![Researcher Holding an Ice core sample](images/IceCoreSlice.png)
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