In October 2019, the World Glacier Monitoring Service (WGMS) – a conglomeration of international scientists – sent a letter of concern to the United Nations Framework Convention on Climate Change (UNFCCC) ahead of the COP25 summit in Madrid.
The letter was co-signed by the Director and 37 National Correspondents of the WGMS and sent to the Executive Secretary of the UNFCCC in the run-up to COP25. The full wording of the letter is available here: https://wgms.ch/cop25/
Attached to the letter were comparison images from the last 30 years supplied by each of the signatory nations. A 3D composite photograph comparison showing Skalafellsjökull between 1989 and 2019 was supplied to illustrate glacier ice loss in Iceland on behalf of the Icelandic Meteorological Office.