Obama Hikes Glacier to Highlight Climate Change0:58

President Barack Obama hiked up to the Exit Glacier in Alaska's Kenai Mountains on Tuesday to highlight the dangers of global warming. Photo: AP

Adventure ... Barack Obama venture into the Alaskan wilderness with Bear Grylls for a television show exploring climate change. Picture: Supplied/Discovery Channel

Reuters and Network WritersNews Corp Australia Network

THEY shared tea made out of flower clusters, ate wild salmon picked over by a bear, talked about being a dad and discussed climate change — all while snipers kept watch from the mountains and the official food taster looked on warily.

US President Barack Obama’s Running Wild Alaska episode with British wilderness expert Bear Grylls airs 7.30pm Friday, and Grylls said the short trip shows an intimate and fun side of Mr Obama that has rarely been seen.

“He said it was one of the best days of his presidency,” Grylls told reporters.

“There were times along the route I had to pinch myself and think, actually, this is the president of America.”

Roughing it ... President Barack Obama runs wild in Alaska with Bear Grylls. Picture: Foxtel

Roughing it ... President Barack Obama runs wild in Alaska with Bear Grylls. Picture: FoxtelSource:Foxtel

Delicacies ... Bear Grylls and President Barack Obama ate wild salmon picked over by a bear. Picture: Discovery Network

Delicacies ... Bear Grylls and President Barack Obama ate wild salmon picked over by a bear. Picture: Discovery NetworkSource:Foxtel

The episode was filmed in September on a trek to Alaska’s shrinking Exit Glacier that was aimed at drawing world attention to climate change.

Last year alone, the Exit Glacier melted and retreated 57 metres toward the Harding ice field, which has itself lost 10 per cent of its mass since 1950.

Mr Obama is the first sitting president of any nation to take part in Running Wild with Bear Grylls, following in the footsteps of celebrities like Ben Stiller, Kate Winslet and Zac Efron.

Grylls, a former SAS soldier turned adventurer and survival specialist, said the idea for the TV episode came from the White House.

“They (the White House) approached us, saying would we consider taking the president on an adventure to Alaska. I almost didn’t really believe it. I thought this was a spoof,” Grylls said. Grylls said a team of about 50 Secret Service personnel, a food taster, snipers and helicopters accompanied the pair during the daylong trek through a forest and across a glacial outwash.

Awareness raising ... the episode was filmed in September on a trek to Alaska’s shrinking Exit Glacier. Picture: Foxtel

Awareness raising ... the episode was filmed in September on a trek to Alaska’s shrinking Exit Glacier. Picture: FoxtelSource:Foxtel

Mr Obama threw himself into it, shrugging off the food taster, sharing Gryll’s water bottle, lighting fires and eating berries.

“He didn’t have any problems. He wanted the physicality ... he was up for everything,” Grylls said.

Asked what he had learned from the trip, Grylls quipped: “Whoever you are, everyone puts their trousers on one leg at a time.”