AAP: Researchers have warned that the world’s ice sheets might melt faster than previously thought. A study based on rare, preserved stalagmites in a coastal cave in Italy has provided a timeline of sea level rises during warm periods of the earth’s history. Australian and European researchers have calculated the stalagmites are about 190,000 to 245,000 years old, during which time there were three warm periods, reflected in three peaks in sea level. It’s the oldest record of …