Final answer:
When large expanses of ice melt in polar regions, sea levels rise, the earth's albedo decreases, and atmospheric circulation patterns change.
Step-by-step explanation:
Firstly, sea levels rise due to the meltwater from glaciers and the greater volume of warmer water. This can lead to inundation of shorelines and the disappearance of some islands. Secondly, the earth's albedo decreases as the reflective ice is replaced by darker water and land surfaces, which can contribute to further warming. Lastly, atmospheric circulation patterns change due to the altered temperature and pressure gradients caused by the melting ice. These changes can have wide-ranging impacts on global climate and weather patterns.