Climate change will have a big impact on Iceland and Icelandic waters, as on most other countries and regions. Almost all of Iceland‘s glaciers are receding, and scientists predict that they may largely vanish in the next 100-200 years. Of special concern to Iceland is ocean acidification, which may have a profound impact on the marine ecosystem. Rapid acidification is observed in parts of Icelandic waters, shrinking the habitats of bivalves and many other organisms. This article is an abstract from the third report on impacts of climate change in Iceland. The report was issued in May 2018 by a Scientific Committee on Climate Change lead by the Icelandic Met Office.