Andy Lee Robinson crafted this visualization of the changes in volume of Arctic Sea Ice from 1979-2012, compared to 1979. (He also composed and performed the music!)
Arctic Sea Ice Minimum Volumes 1979-2012
The rate of ice loss in the Arctic is staggering. Since 1979, the volume of Summer Arctic Sea Ice has declined by 80% and is accelerating faster than scientists believed it would, or even could melt.
The first ice-free summer in the Arctic Ocean is expected to happen between 2016 and 2022.
Technical details are available on the YouTube page.
H/T Naked Capitalism