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Welcome to The Guardian Long-Read, showcasing the best long-form journalism covering culture,

politics and new thinking. For the text version of this and all our long-reads, go to the Guardian.com

forward slash long-read. The tree line is out of control. How the climate crisis is turning the

Arctic green, by Ben Rollins, read by Christian Anhalt and produced by Hatty Moeer.

Alta Fjord is a wide expanse of black water on the edge of the barren sea,

ringed with mountains. Alta is a relatively large town in the finmark province,

the crown of the horse's mane that forms Norway's jagged coastline and Europe's northern shore.

Here at sea level, the most northerly trees in Europe are moving up slope, gobbling up the

tundra as they go. The people and animals that live here are trying to make sense of the rapid

changes with a mixture of confusion, denial and panic. Dawn at 70 degrees north during winter,

last nearly the whole day. The sun never rises. The day is permanently on the verge of breaking.

It is disorienting. On the way to city hall from the guest house, I spied few pedestrians.

Alta is a town built along the American principles. That is to say a town built for a world in which

petrol is cheap and cars are taken for granted. It is a landscape of shopping malls, gas stations and

spaced out residential suburbs. Normally, at this time of year, it isn't safe to be outside for

long without wearing animal skins, but on the day of my visit, it was only minus one degrees.

...