There as been a lot of attention about the diminishing Arctic sea ice in recent years. We’re often exposed to images showing the extremes. My goal was to show the changing sea ice month by month , and even day by day . Sea ice is a critical component of our planet because of its influence on the global climate. The sea ice cover in the Arctic in September 2015. The black line is the median extent (1981-2010) for this month. See interactive version . The graph shows the change in sea ice cover for September since 1979, in percent from the mean extent (1981-2010). September 2015 had the fourth lowest extent in the satellite record. See interactive version . The National Snow and Ice Data Center (NSIDC) provides two great datasets collected by satellite of the Arctic Sea Ice: Sea Ice Index You get the longest time-series using Sea Ice Index, which dates back to November 1978. The dataset is available at 25 km resolution. The images and data are produced in a con...