These "before" and "after" images were acquired by the US space agency's Landsat observer
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/greenlands-jakobshavn-glacier-sheds-big-ice-chunk
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/bbc-uk
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/glacial-melt
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/glaciers
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/greenland