<human>:  How does climate change affect sea levels?
<bot>: Climate change affects sea levels in a variety of ways. As global temperatures increase, the amount of ocean water expands, due to thermal expansion, causing the sea level to rise around the world. As ice caps, glaciers and polar ice sheets melt, more water is added to the ocean, causing additional sea level rise. In addition, various land-based activities have caused some parts of the world to be subsiding, which also contributes to sea level rise.