Local researchers and their American peers from Rice University planned a memorial ceremony to mark this tragic occasion.
It unveiled a bronze plaque as a tombstone that bears the inscription "A letter to the future" as its title, a grim reminder of what human activity and climate change are doing the world.
Ok is the first Icelandic glacier to lose its status as glacier.
"In the next 200 years all our glaciers are expected to follow the same path. Only you know if we did it", the plaque read.
In addition to that scary message, it also notes the current level of Carbon dioxide in the atmosphere so that generations in the future have a reference point to look back on.
Howe noted that the conversation about climate change can be abstract, with many dire statistics and sophisticated scientific models that can feel incomprehensible.
Howe said that memorializing a lost glacier emphasizes what is being lost and disappearing all over the world.
"Perhaps a monument to a lost glacier is a better way to fully grasp what we now face", she said, highlighting "the power of symbols and ceremony to provoke feelings".
The glacier used to measure 16 square kilometers but it shrank to less than one square kilometer and no longer fulfilled the criteria to be called a glacier.
Icelandic Prime Minister Katrín Jakobsdóttir said, "We have no time to lose".
If that doesn't make you sweat, the rising temperatures sure will.
Climate change is real and it needs to be acted upon immediately.
Okjokull glacier was declared dead in 2014.
"But if the predictions of the scientists. if we see them happening, we will see other glaciers disappear in the next decades and centuries, which is obviously a very big thing for our landscape, nature, ecosystem, but also for our energy system because we produce renewable energies from the glacier rivers".
The International Union for Conservation of Nature estimates that almost half of the world's heritage sites could lose their glaciers by 2100 if greenhouse gas emissions continue at the current rate.