PIG already makes the largest contribution to sea - level rise of any single Antarctic
glacier and the fact that its bed increases in depth upstream for more than 200 km
means there is the possibility of runway retreat that would result in an even
bigger contribution to sea level.»
Dr Cook says: «We considered that a lake was dangerous if there were settlements or infrastructure down - valley from the lake, and if the slopes and
glaciers around the lake were very steep,
meaning that they could shed ice or snow or rock into the lake, which would cause it to overtop and generate a flood — a bit like jumping into a swimming pool, but on a much
bigger scale.