Ice cores contain trapped air bubbles that reveal the composition of ancient atmospheres, including carbon dioxide and methane levels.
Sources
- Greenland Ice-core Project/Greenland Ice Sheet Project 2 | geochronology | Britannica (britannica.com)
- https://science.nasa.gov/earth/earth-observatory/paleoclimatology-the-ice-core-record/ (science.nasa.gov)
- https://gml.noaa.gov/outreach/faq_cat-3.html (gml.noaa.gov)
- https://nsidc.org/learn/ask-scientist/core-climate-history (nsidc.org)
- https://www.antarcticglaciers.org/glaciers-and-climate/ice-cores/ice-core-basics/ (antarcticglaciers.org)
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