Researchers are marking the spot with a memorial plaque where a glacier once towered over Iceland's landscape - before global warming killed it.

Okjokull - Or, OK for short - was one of around 400 glaciers crowning the mountains of Iceland.  But it lost its glacier status in 2014 when the area had warmed up so much that OK was just a puddle.  All of Iceland's glacier face the same fate by the year 2200 if nothing is done about global warming.

"This will be the first monument to a glacier lost to climate change anywhere in the world," said anthropologist Cymene Howe from Rice UNiversity in Houston.  "By marking Ok's passing, we hope to draw attention to what is being lost as Earth's glaciers expire.  These bodies of ice are the largest freshwater reserves on the planet and frozen within them are histories of the atmosphere."

Next month, the scientists from Iceland and the United States will dedicate the memorial plaque to forever mark the spot where Ok once sat, and it contains a simple message to the future:

"Ok is the first Icelandic glacier to lose its status as a glacier," it reads.  "In the next 200 years all our glaciers are expected to follow the same path.  This monument is to acknowledge that we know what is happening and what needs to be done.  Only you know if we did it."

Beneath the dedication date of August 2019, it gives the reading of "415ppm C02", which is the greenhouse gases in Earth's atmosphere - 415 parts per million Carbon Dioxide.  That is probably the highest amount our planet has seen since before humans evolved.