Are glaciers retreating faster or slower than predicted?

Galciers are the most important reservoirs of fresh water storing about 2/3 of total freshwater. If they dissapear, that would lead to serious social and economic tensions around the world. Some studies states that they are retreating faster than expected. For instance, Mernil et al., (2011) states that Greenland is melting faster than expected. On the other side, other studies state that we are not yet in the worst case scenario, and glaciers are melting slower than predicted (Sidney Morning Herald 2012Sidney morning Herald 2012) Besides the controvery that may arouse from those 2 point of views, the fact is that glaciers are retreating and we must take action to achieve better water management actions.