The very fact that there are ice caps in and around the Arctic means we are in an ice age.
It started 2.6 million years ago and we are now in a warm period we call an interglacial.
If the ice caps melted very quickly it could allow a lot of fresh water into the northern oceans so altering the flow of warmer water from the south. This could mean that those countries in the north will not receive the warming waters we need to stave off another glaciation.
If the ice caps melted slowly however, it could mean we would leave the ice age for a long time. The downside to that means that hot countries could become hotter and drier.

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