Unpredictable Arctic Ice Imperils Pacific Walrus

So says Scientific American. After a sensitive and caring intro about how the Yupik and Inupiat hunters depend on butchering walruses to maintain their squalid life-style, we learn that (portentous music):

As the Arctic warms, the landscape upon which both walruses and people depend is changing. The behavior of sea ice is no longer predictable. Perhaps the best illustration of that came in the summer of 2007, when the Arctic's sea ice hit a record low, shattering the previous record by 460,000 square miles -- an area the size of Texas and California combined.

Changing habits of polar bears have drawn most of the attention, but walruses, which depend on drifting summer sea ice as a base for hunting and transportation through the Bering Strait, are changing, too. They are sheltering more on land in Alaska and Siberia. For Alaska's indigenous hunters, whose lives meld modern conveniences with their traditional subsistence culture, the change threatens a way of life.

1. How does the inconveniencing of hunters who prey on them "imperil" the walruses?
2. How does the breaking off of MORE ice floes cause the walruses to change their floe-riding habits?
3. What the hell is this sort of human interest drivel doing in the Scientific American?