Harington said it was a "very sad irony" to film in locations with diminishing ice for scenes where the arrival of winter, and the frosty undead from beyond the Wall, is feared by his character.
"We went to Iceland to find snow, because winter is here," the actor told
Time. "We got there and we were lucky to get the snow we did, because in our world, winter is definitely not here. It's this weird parallel, the opposite parallel.
"We go out there this year, and the glacier that me and Rose [Leslie, who played his love interest Ygritte] filmed on four years ago, I saw it and it has shrunk. I saw climate change and global warming with my own eyes, and it is terrifying."