Guy Edwardes / Doorway in abandoned cottage, Isle of Harris, Outer Hebrides, Scotland, UK. March 2014.

Guy Edwardes / Stove in abandoned cottage, Isle of Harris, Outer Hebrides, Scotland, UK. March 2014.

Ashley Cooper / Maize (Zea mays) husks that are used as a renewable fuel to burn on household stoves, northern China, March 2009.

Ashley Cooper / Maize husks that are used as a renewable fuel to burn on household stoves, northern China, March 2009.

Christophe Courteau / Flame of gas cooker in kitchen

Christophe Courteau / Flame of gas cooker in kitchen

Christophe Courteau / Flame of gas cooker in kitchen

Eric Baccega / Nenet woman checking water for tea, inside tent. Yar-Sale district. Yamal, Northwest Siberia, Russia. April 2016.

Eric Baccega / Nenet woman preparing muksun fillet inside tent. Yar-Sale district. Yamal, Northwest Siberia, Russia. April 2016.

Graham Eaton / Robin (Erithacus rubecula) sitting on a poker beneath a warm log fire; Capel Curig, Wales April

Bryan and Cherry Alexander / Inuit hunter lighting stoves to warm his tent, Northwest Greenland, 1986. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuk asleep in hut with stove for warmth. Northwest Greenland, 1980.