If you are interested in watching the progression of the summer melting of the ice sheet on Greenland, you will find the web site for the National Snow and Ice Data Center useful. You can see daily updates of the melting conditions from satellites at https://nsidc.org/greenland-today/.
Why do we care? A melting Arctic can change energy patterns across the northern part of the globe, which has the potential to shift weather patterns that control the climate across the world as well as extreme weather events. This article from Bloomberg explains how it works. WunderBlog also has an article describing the recent changes in the Arctic due to the warming climate here and their global impacts, such as rising sea levels.