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Today, a trip to finish Lapland and a warning from its forests to the rest of the world.

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The flight uptakes about one hour, and it was in August, so it was the end of the Arctic summer. And I arrived at Helsinki in night, and I was flying towards the light.

The sun hadn't quite set where I was going in the far north of Finland. But that was my kind of first memory of the light. The sun hadn't quite set where I was going in the far north of Finland.

But that was my kind of first memory of flying into a Finnish Lapland really and seeing

this glow on the horizon that got brighter and brighter.

Patrick Greenfield, a biodiversity reporter at The Guardian, recently took a trip to the very north of Europe to see the primeval forests of the continent's last true wilderness.

Sorry, do you mind if I record our conversation?

They are this magical place that is frozen most of the year, but then de-frrosts and bursts into life in those long Arctic summer days

and then descends back into darkness when it's freezing cold and there's only kind of reindeer

and the northern lights to keep the people living their company along with a few polar bears

in some places and different parts of the boreal ecosystem.

Patrick met up with local activists who keep tabs on the forests and the rare species who live there.

And they were going to show me some of the last surviving bits in that area of primeval forest,

forest that developed after the last ice age and had never been disturbed or touched by humans before.

So as you see, there are old trees, the dry deadwood standing and laying.

Oh yeah, wow. The ecosystem is very diverse.

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