
Yet the biggest emitters, like the United States and China, are also geopolitical competitors. No one country can prevent catastrophic warming on its own every country that's a major greenhouse gas emitter is part of the problem. Specifically, it sounds like the problem of international coordination on climate change.

Swap climate change for White Walkers and "countries" for noble houses, and it starts to sound a lot like the real world. White Walkers are generally ignored some nobles deny their existence outright. Yet instead of uniting to combat the shared threat to human existence itself, the noble houses in the show spend basically all their time on their own petty disagreements and struggles for power.

The White Walkers are a threat to all humanity: Their zombie minions are equally happy to rip apart people of all nations and noble houses. This parallel has become increasingly clear over the course of the show - as this video shows: It sounds a lot, in short, like the problem of climate change (other than the part about the White Walkers being "designed"). Yet humanity is ignoring the White Walker threat in favor of internal squabbling. Today, they have spun out of anyone's control and threaten the very foundations of human civilization.

So that means the White Walkers are a quasi-natural backlash to humanity's growth and expansion. The creation of the White Walkers, powerful monsters specifically designed to kill humans, was the Children's response. After the humans came, they went to war with the Children of the Forest over territory. The Children of the Forest are a nature-worshiping magical race who lived on Westeros before humanity's arrival. In "The Door," we learned that the White Walkers were created by the Children of the Forest, as a weapon in a war against humanity.

Spoilers follow for "The Door," the fifth episode of Game of Thrones ' sixth season.
