Can bitcoin be sustainable? Inside the Norwegian mine that also dries wood

Kryptovault's operation is part of a fightback against criticism of the famously energy-intensive industry

A line of large blue skips full of chopped wood sit at the back of a site belonging to Norway's biggest bitcoin mining operation, a 5,000 sq metre warehouse on the outskirts of Honefoss, a small town 40 miles west of Oslo.

Hot air is being pumped into the 12 skips through bendy corrugated pipes curling out from the warehouse. Despite the snow, it will take a few days for the logs to be dried out, after which a local lumberjack, grateful for the free service, will take them away for sale.