Arctic and Antarctic Sea Ice

http://www.ijis.iarc.uaf.edu/en/home/seaice_extent.htm

http://www.iup.uni-bremen.de:8084/amsr/ice_ext_s.png

Ice is almost as controversial as CO2 and just as hard to understand.  Sea ice extent is what is most often used to try and determine if the polar ice caps are shrinking or growing, but if you scan through the articles on WUWT you soon learn how deceptive that can be.  Poor measurement criteria though it may be, it is what we have to work with.  Both the Arctic and Antarctic ice extents are tracked by satellite and are on line.

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