Barack Obama has said that equal marriage coming to all 50 states was one of his “favourite moments” last year.

The President was speaking to People Magazine for the New Year when he opened up about his favourite things to happen in 2015.

He picked out the reception he held after the Supreme Court ruled that same-sex marriage is a constitutional right, cementing weddings in all 50 states.

Listing his favourite moments, he said: “The gathering outside the White House following the Supreme Court ruling upholding the right of same sex couples to marry.”

Among other moments was his appearance in a Bear Grylls survival documentary.

He said: “In September, I became the first sitting president to visit north of the Arctic Circle, but before I made it up there, I checked out a glacier and trekked through the Alaskan wilderness with Bear Grylls.

“Now, based on what I know of Bear, this could have gone a number of ways – and I did end up eating a salmon that had been gnawed on by an actual bear – but we had a great time.”

“The landscape was breathtaking, and so were the very real effects of climate change, which become hard to ignore when the ice is melting into your hands

“I thought it was important to talk about protecting the only planet we have, but I never thought I’d be Running Wild with Bear Grylls.”

Obama also picked a marriage-themed book as his favourite read of 2015.

People recalled: “The president, a famous bibliophile, says his favorite book of 2015 is Fates and Furies by Lauren Groff, a novel that explores the key to a great marriage from two different perspectives.

“Topping the First Lady’s book list is another portrait of a marriage, The Light of the World, Elizabeth Alexander’s memoir about the sudden death of her husband.”