# On Thin Ice: Changing Ice Cover on Polar Oceans

NASA scientist Thorsten Markus shares his expertise on polar ice in a lecture at the Library of Congress. In his lecture, Markus summarizes recent observations and findings-together with pictures from Arctic and Antarctic research campaigns-and puts those results into the bigger climate-system picture. He focuses on recent changes in the Arctic and in Antarctica. Markus explains why the two hemispheres react differently to climate change, and concludes his lecture by discussing current and future efforts to address the uncertainties and contradictions of the ice conditions.

- Kind: Talk
- Year: 2009
- By: Library Of Congress. Science, Technology, And Business Division
- Genres: Science
- Archive: [Library of Congress](https://www.loc.gov/item/2021688355/)
- Licence or status: Rights statement at the Library of Congress (as the archive states it)
- Credit: Library of Congress
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/loc/2021688355?play=1)