Hotter summers may not be such a disaster for the Greenland ice sheet after all, if the latest research is anything to go by. Scientists have found that Greenland glaciers flow slower in warmer summers than they do during cooler ones. Although this seems counter-intuitive, the researchers explain that during cooler summers, a small amount of melted water from glaciers’ surfaces seeps down to their bases, lubricating them so they move more easily.