The sun is a pale smudge in the sky, a pinhole promise of light and warmth, as we lurch and bump across the frozen land in pursuit.

BBC: In Sweden, a long journey home

Most loggers harvest when the land is frozen, but a run of mild winters has melted the logging roads and made it impossible to harvest the wood without scarring the land which, in turn, gives environmentalists more cause for complaint.

ECONOMIST: The logging industry

The land, even when frozen, is a generous ally, providing food, shelter and warmth if you know where to look for it.

BBC: In Sweden, a long journey home

The Mabo and Wik judgments have changed Australia's notions of land ownership, which had frozen aborigines out since white settlement in 1788.

ECONOMIST: Australia

The trips all start with a five-hour private flight from Cape Town to an ice runway perched atop a 50m-tall frozen waterfall located within the Dronning Maud Land region in eastern Antarctica.

BBC: Camp with penguins in Antarctica