outhold

joined 1 year ago
[–] outhold@lemmy.world 16 points 1 year ago* (last edited 1 year ago)

They have various methods. One of the common ones is analyzing ice core samples. The ice sheets are accumulated over the years so each layer on ice sheets is from a certain historical period (much like tree trunks.) By analyzing the chemical status of the ice core on each layer, they can extract data, such as temperature, about a certain period.

[–] outhold@lemmy.world 1 points 1 year ago
[–] outhold@lemmy.world 10 points 1 year ago

120k years ago was about the end of the Eemian interglacial period, which was a significantly warm period.