Del anterior enlace me ha llamado la atencion esto... a ver que nos comenta diablo sobre esto...
Figure 6. This graph shows reconstructions of sea ice extent in the Kara and Barents Seas from 1289 to 1993 (red line). The gray line shows the 30-year average, the blue line shows observed sea ice extent, and the green line shows the trend.
Credit: Qi Zhang (Institute of Polar Meteorology, Chinese Academy of Meteorological Sciences, Bejing, China) and Cunde Xiao (Stake Key Laboratory of Earth Surface and Resources Ecology, Beijing Normal University, Bejing, China)