The recent frequent Volcanic eruptions in Iceland have nothing to do with climate change.
Volcanoes have this thing under them called "Magma Chambers". It is a container for magma that slowly fills up over a long period until it breaks resulting in Volcanic eruption on top of it.
The time it takes for the magma chamber to fill up resulting in an eruption varies from one magma chamber to another. Some fill up in 5 years, other 10, 50 or even 200 years.
It just so happens now in Iceland that multiple magma chambers are filling up at around the same time. This is a complete coincidence but it has been known for over 20 years that this was about to happen.