Since their existence in the little Ice Age, glaciers have witnessed increasing rates of glacier retreat. This is mainly due to having a warmed world. The Earth's surface temperatures become warmer so that it causes glaciers to melt and retreat. It has been reported that the glaciers areas have decreased by 50% since the end of the 19th century. Even the size of the glacier is noticeably decreasing in many different areas of the world such as in the Alps. When those glaciers melt, they increase the output of the rivers that go into the sea causing a rise in the sea level.
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