This video compares two Arctic summers side-by-side. On the left is 1980 and on the right is 2012. Arctic sea ice begins to melt around March and continues to do so until September. Since 1979 we have been able to observe the changes in sea ice by satellite. We can see even in the last 30 years there has been a dramatic change in the degree of melting. The Old Weather project is currently looking at logs from ships that sailed through these Arctic waters, long before we had satellites, in order to better understand the pattern of climate change and its effects on the sea ice. Read more on the Old Weather blog here, and have a go at classifying the ships logs at

To keep up-to-date with all interesting news and results from Old Weather, like it on Facebook and follow it on Twitter and Google+.