What is sea level change?

Sea level change is a change in the level of the sea in relation to a particular land benchmark.  Sea levels have always been changing and are influenced by a number of different factors.  What is worrying climate scientists is that sea levels have been  rising particularly quickly over the last 40 years.  This recent rise has mostly been caused by an increase in the amount of water in the ocean and an increase in the ocean’s temperature, which causes the water to expand.  Both of these factors have been attributed to the human causes of climate change.

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