Here We Go Again With the Wilkins Ice Shelf

This is CNN (you know, no bias; no bull) — so complete the last sentence from this article’s first few paragraphs for me:

A large ice shelf is “imminently” close to breaking away from part of the Antarctic Peninsula, scientists said Friday.

Satellite images released by the European Space Agency on Friday show new cracks in the Wilkins Ice Shelf where it connects to Charcot Island, a piece of land considered part of the peninsula.

The cracks are quickly expanding, the ESA said.

Scientists are investigating the causes for the breakups and whether it is linked to…

So guess which of the following completes this last sentence excerpted from CNN’s report? Your choices:

1) …wind and wave conditions.

2) …volcanic activity.

3) …stress caused by ice growth.

4) …natural processes.

5) …global climate change.

Remember, it’s no bias and no bull, so your choice should be a difficult one. Right?