The rapid ice-melt being observed in the polar regions has been attributed to the high frequency bursts of noise emitted in whalesong. As whale numbers are ever increasing, the polar caps are shrinking and this causes major concern for low lying countries. Greenpeace has called out for the wholesale slaughter of all species of whale to reduce the risk. The larger the whale, the larger the damage, so Greenpeace are themselves said to be targetting the humpback and blue whales. The Rainbow Warrior 2 has been fitted with a fixed underwater steel ram and explosive tipped harpoon guns.