tundra

When Dave Pettifer was a Royal Marines commando, he fought in the jungle, endured the Arctic tundra and completed three tours of Afghanistan.

These extremely remote islands about 1,000 miles north of Antarctica consist mostly of barren tundra.

Its stated goal is to create herds of what it calls mammoth-like creatures to live in the arctic tundra.

The Arctic tundra is being transformed into an overall source of CO2, thanks to warming and frequent fires, according to the US science group NOAA.

We tag along with a group from PBI to search for bears on the sub-Arctic tundra - just a few miles from town.