Iceland on Sunday honours the passing of Okjokull, its first glacier lost to climate change, as scientists warn that some 400 others on the subarctic island risk the same fate.

A bronze plaque will be unveiled in a ceremony starting around 1400 GMT to mark Okjokull — which translates to “Ok glacier” — in the west of Iceland, in the presence of local researchers and their peers at Rice University in the United States, who initiated the project.

Iceland’s Prime Minister Katrin Jakobsdottir, Environment Minister Gudmundur Ingi Gudbrandsson, and the United Nations High Commissioner for Human Rights Mary Robinson are also due to attend the event.