Ashley Cooper / Tomatoes growing in greenhouse powered by geothermal heat, Hveragerdi , South West Iceland.

Michel Roggo / Hot springs at Hveragerdi, Iceland, September 2009. Photographed for the Freshwater Project.

Michel Roggo / Hot springs at Hveragerdi, Iceland, September 2009. Photographed for the Freshwater Project.

Michel Roggo / Hot springs at Hveragerdi, Iceland, September 2009. Photographed for the Freshwater Project.

Cyril Ruoso / Cucumbers growing in greenhouse heated by geothermal hot spring, Hveragerdi, Iceland, May 2007.

Cyril Ruoso / Greenhouse growing green peppers heated by geothermal spring, Hveragerdi, Iceland

Cyril Ruoso / Greenhouse growing tomatoes heated by geothermal spring, Hveragerdi, Iceland

Cyril Ruoso / Cucumbers, tomatoes and roses growing in greenhouse heated by geothermal hot spring, Hveragerdi, Iceland

Christophe Courteau / Steam rising through road in town heated by geothermal activity, Hveragerdi, Iceland

Christophe Courteau / Greenhouse heated by geothermal activity, Hveragerdi, Iceland