1. Shrinking Sea Ice Hints at Global Warming Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers NewsMay 14, 1991 Vol. 9, no.5

2. Source: http://www.photolib.noaa.gov

3. Photo source: Alaska Digital Archive

4. Polar Ice Cap Thinning – Global Warming to Blame? Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers NewsJune 12, 1991 Vol. 9, no.6

5. Photo source: http://commons.wikimedia.org/

6. Photo source: Alaska Digital Library

7. Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers NewsNovember 14, 1999Vol. 15, no.6 Arctic sea ice thins

8. Photo source: Alaska Digital Library

9. Polar Sea Ice Could be Gone by End of the Century Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers News March 27, 2004Vol. 20, no.3

10. Photo source: Alaska Digital Archive

11. Polar bears’ habitat endangered by thinning ice Photo source: Alaska Digital Archive SeaGrant Sentinel Alaska Seas and Rivers News July 17, 2005Vol. 21, no.7

12. source: http://commons.wikimedia.org/ Photo

13. Photo source: Alaska Digital Archive

14. Meltdown: Arctic life may be threatened Photo source: Alaska Digital Archive SeaGrant Sentinel Alaska Seas and Rivers News August 11, 2006Vol. 22, no.8

15. Photo source: Alaska Digital Archive

16. Arctic Sea Ice Melt Accelerating Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers News October 4, 2006Vol. 22, no.10

17. Photo source: http://photolib.noaa.gov

18. SeaGrant Sentinel Alaska Seas and Rivers News July 10, 2005Vol. 21, no.7 Record Low for June Arctic Sea Ice

19. Photo source: Alaska Digital Archive

20. Arctic Sea Ice Gone in Summer Within Five Years Photo source: Alaska Digital Archive SeaGrant Sentinel Alaska Seas and Rivers News December 12, 2007Vol. 16, no.5

21. Photo source: http://www.photolib.noaa.gov

22. Photo source: http://www.photolib.noaa.gov/ SeaGrant Sentinel Alaska Seas and Rivers News March 19, 2008Vol. 23, no.3 Arctic Sea Ice Still At Risk Despite Cold Winter, NASA Says

23. Photo source: http://photolib.noaa.gov

24. Arctic ice shrinks to new record low! Photo source:NASA/Goddard Space Flight Center Scientific Visualization Studio, via Reuters SeaGrant Sentinel Alaska Seas and Rivers News October 3, 2008Vol. 25, no.10

25. Photo source: http://photolib.noaa.gov What do we know about sea ice and how it is changing?