A warming climate can cause seawater to expand and ice over land to melt, both of which can cause a rise in sea level.
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First, warmer temperatures cause ice on land like glaciers and ice sheets to melt, and the melt water flows into the ocean to increase sea level. Second, warm water expands and takes up more space than colder water, increasing the volume of water in the sea. Sea level rise will hit the coasts the hardest.
