If all glaciers and ice sheets on Earth melted, global sea levels would rise by about 260 feet. This rise would lead to severe flooding of coastal areas, displacing millions of people and altering ecosystems. Thus, the correct answer is C: sea level will rise about 260 feet.
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If all glaciers and ice sheets on Earth melted, global sea levels would rise by about 260 feet. This significant rise would have severe impacts on coastal areas and ecosystems. The melting ice primarily comes from ice sheets in Greenland and Antarctica. ;