They do not know of that of which we speak
Words fail me, too.
Among the many cruel and unexpected ironies of the melting Arctic - and fasten your seat belts, kids, there are plenty more coming! - is the fact that the Inuit people who populate the region are quite literally unable to describe their changing world. As global warming melts the polar ice, plant and animal species advance northward into areas where they have never before been seen. Elk, salmon, barn owl, robin: Many indigenous languages simply lack words for these species. (Link)