Reindeer in Lapland have a number of important jobs this time of year – including helping the climate. By gobbling up shrubs, they help increase the reflectivity of snow and ice.
It's just after lunchtime, and darkness is already falling. Tiina Jeremejeff, a reindeer herder in northern Finland, jumps on a snowmobile to go and feed her family's herd, who are kept in a large enclosure in the winter. Her breath freezes almost instantly in the bitter cold – it's -15C (5F) here in Kierinki, 110km (68 miles) north of the Arctic Circle. There is a thick cover of snow in the forest, some 20cm (7.9in) deep.
