David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers on the bore. Severn Estuary. England

David Woodfall / Surfers on the bore. Severn Estuary. England

David Woodfall / Surfers on the bore. Severn Estuary. England

Solvin Zankl / Seeds of Common storksbill (Erodium cicutarium), Europe. In dry conditions, the ripe seeds are ejected from the fruit. The seed tails are formed from the persisting style which consists of hygroscopic...

Ashley Cooper / Krafla geothermal power station near Myvatn, Iceland, which produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Part of geothermal plant that removes water from the steam before it feeds turbines at Krafla geothermal power station near Myvatn, Iceland,September 2010.

Ashley Cooper / Part of geothermal plant that removes water from the steam before it is fed into turbines at Krafla geothermal power station near Myvatn, Iceland,September 2010.

Ashley Cooper / Krafla geothermal power station near Myvatn, Iceland, which produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Krafla geothermal power station near Myvatn, Iceland, which produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Control room hall of Krafla geothermal power station, which produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Pipes carrying steam to the steam turbines in Krafla geothermal power station. Krafla produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Pipes carrying steam to the steam turbines in Krafla geothermal power station. Krafla produces electricity as well as supplying hot water to heat buildings in the surrounding area. September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland is the worlds second largest geothermal power station. It also supplies hot water via a pipeline to Reykjavik for space heating for households...

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / A pipeline taking geothermally heated hot water from Hellisheidi geothermal power station in Hengill, to Reykjavik, Iceland. September 2010.

Ashley Cooper / Capturing geothermal steam from boreholes to power the Svartsengi geothermal power station in Keflavik near Reykjavik in Iceland. September 2010. The power station produces electricity and supplies ho...

Ashley Cooper / Capturing geothermal steam from boreholes to power the Svartsengi geothermal power station in Keflavik near Reykjavik in Iceland. September 2010. The power station produces electricity and supplies ho...

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Ashley Cooper / Hellisheidi geothermal power station in Hengill, Iceland. It also supplies hot water via a pipeline to Reykjavik for space heating for households and industry September 2010.

Jurgen Freund / Aerial of Dam in the outback serving as watering holes for cattle. Dam water comes from bore water from the Great Artesian Basin, South Australia, Australia, June 2011

Jurgen Freund / Aerial of Dam in the Strzelecki Desert for cattle just out of Birdsville belonging to Pandie Pandie Station. Dam water comes from bore water from the Great Artesian Basin, South Australia, June 2011

Jurgen Freund / Aerial of Dam in the Strzelecki Desert for cattle just out of Birdsville belonging to Pandie Pandie Station. Dam water comes from bore water from the Great Artesian Basin, South Australia, June 2011

Jurgen Freund / Aerial of Dam in the outback serving as watering holes for cattle. Dam water comes from bore water from the Great Artesian Basin, South Australia, Australia, June 2011

Gavin Hellier / The Blue Lagoon, Iceland's most famous tourist attraction is located among the black lava flows outside Reykjavik. The geothermal spa owes its existence to the Svartsengi geothermal power plant powere...

Gavin Hellier / The Blue Lagoon, Iceland's most famous tourist attraction is located among the black lava flows outside Reykjavik. The geothermal spa owes its existence to the Svartsengi geothermal power plant powere...

David Woodfall / Putcher fisherman (John Powell) carrying drift wood deposited by Severn bore. The traditional way of fishing here is potentially threatened by the proposed tidal barrage. Gloucestershire, England, UK...

Steven David Miller / Brumby horse (Equus caballus) walking to water, Bore wetland on Muloorina Station, South Australia

Steven David Miller / Brumby horse (Equus caballus) walking to water, Bore wetland on Muloorina Station, South Australia

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Surfers & pleasure boats ride the bore, seen from the river. Severn Estuary. England

David Woodfall / Pleasure boats take advantage of the bore, Severn Estuary, England

David Woodfall / Pleasure boats take advantage of the bore, Severn Estuary, England

David Woodfall / Pleasure boats take advantage of the bore, Severn Estuary, England

David Woodfall / Surfers ride the bore. Severn Estuary. England, August 2009

David Woodfall / Woman hanging her washing, pauses to watch the bore and pleasure craft. Severn Estuary. England, August 2009

David Woodfall / Woman pauses from hanging washing, to watch the bore and pleasure craft. Severn Estuary. England, August 2009

David Woodfall / Severn bore lit up by strong sunlight. Severn Estuary. England, August 2009

David Woodfall / Severn bore lit up by strong sunlight. Severn Estuary. England, August 2009