Harp seals and their pups are the subject of the second episode of Frozen Planet II, which is available now on iPlayer. One of the issues with climate change is that it’s really hard to see.

"Some of the pups actually can't swim ... Wimmer said. Grey seals and harbour seals are the most common species on P.E.I., she said. But harp seals and hooded seals spend time on the Island ...