The following animation shows the Arctic sea ices from September 21, 2005 and September 14, 2007. On those two dates the minimum sea ice for the respective year has been recorder.
The images I used to make this animation are courtesy of NASA
There’s no doubt global warming is happening but is it natural or "man-made". One thing’s for sure: I’m not going to wait and see what happens. Prevention is the cure.
This data has been recorded by the Aqua satellite with the AMSR-E module. More information along with a neat January 1, 2007 – September 14th time lapse movie of the same region can be found on NASA’s website.