Sea level rises may accelerate due to melting ice sheet The vast Greenland ice sheet could begin to melt more rapidly than expected towards the end of the century, accelerating the rise in sea levels as a result of global warming, scientists warned yesterday. Water running off the ice sheet could triple the current rate of sea level rise to around 9mm a year, leading to a global rise of almost 1 metre per century, the researchers found. Sea levels are already on the rise as a result of increasing temperatures, because the oceans expand as they warm up, but until now scientists have had a poor understanding of how quickly ice sheets such as those in Greenland and Antarctica will begin to disappear....