Global-warming is a big one totally starting to wipe out the cliffs and glaciers there's also rubbish from exploration groups or tourists. Another big one is the smoke pollution which is gathering over antarctica making it hard for people to see or photograph the aurora borialis or northern lights. Whaling has a massive impact with the animals, and hunters altogether are killing penguins, seals and whales are killing the individual unique animals so many people haven't been able to appreciate.