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People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Peculiar pipework built over the road, Krafla Power Station, is the largest Geothermal power station in Iceland, Polar Regions

Water spout from Strokkur Geysir exploding into the sky on a stormy evening, near Reykjavik, Iceland, Polar Regions

Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

Svartsengi (Blue Lagoon) Geothermal Power Station at sunset, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Leirhnjukur thermal area and eruption site near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions

Geothermal Reykjanes power plant and smoking fumarole at Gunnuhver hot spring, Reykjanes Peninsula, Iceland

Bjarnaflag geothermal power station and diatomite factory, Reykjahlid village, Lake Myvatn, North area, Iceland, Polar Regions

Geo-thermal power plant in the Svartsengi (Black Field) Area, the Blue lagoon is popular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions

The geothermal Krafla Power Station, largest geothermal power station in Iceland, located near the Krafla Volcano, Iceland, Polar Regions

The geothermal Krafla Power Station, largest geothermal power station in Iceland, located near the Krafla Volcano, Iceland, Polar Regions

Krafla Geothermal Power Station, the largest in Iceland with a distinctive cooling tower reminiscent of a cheese grater, Krafla, Iceland, Polar Regions

The Reykjanes Power Station is a geothermal power station located in Reykjanes at the southwestern tip of Iceland, Polar Regions

Steam chimneys, pipes and workers at a volcanic power facility run by Pertamina Geothermal Energy near Tomohon City, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

The Reykjanes Power Station is a geothermal power station located in Reykjanes at the southwestern tip of Iceland, Polar Regions

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Leirhnjukur thermal area and eruption site, near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Capturing geothermal steam from boreholes to power the Reykjanes geothermal power station near Reykjavik in Iceland, Polar Regions

Capturing geothermal steam from boreholes to power the Reykjanes geothermal power station near Reykjavik in Iceland, Polar Regions

Capturing geothermal steam from boreholes to power the Reykjanes geothermal power station near Reykjavik in Iceland, Polar Regions

One of the steam turbines in the turbine hall of Krafla geothermal power station, Iceland, Polar Regions

Three forms of renewable energy on one site, wind power, solar power and geothermal at a fresh lava flow that erupted during the Krafla fires at Leirhnjukur near Myvatn, during the 1970s and 80s, Iceland, Polar Regions

Capturing geothermal steam from boreholes to power the Reykjanes geothermal power station near Reykjavik in Iceland, Polar Regions

Capturing geothermal steam from boreholes to power the Svartsengi geothermal power station in Keflavik near Reykjavik in Iceland, Polar Regions

Part of the plant that removes water from the geothermal steam, before it is fed into the steam turbines at Krafla geothermal power station, Iceland, Polar Regions

A pipeline taking geothermally heated hot water from Hellisheidi geothermal power station in Hengill, to Reykjavik, Iceland, Polar Regions

Part of the plant that removes water from the geothermal steam, before it is fed into the steam turbines at Krafla geothermal power station, Iceland, Polar Regions

Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland

Strokkur geyser erupting, in the Geysir hot springs area, Haukadalur geothermal area, Southwest Iceland

Visitors drinking cocktails in the Geothermal spa, Blue Lagoon at the geothermal power plant, Grindavik, Island

Wairakei Geothermal Power Station, Pipelines and steam at sunset, near Taupo, North Island, New Zealand

Puente del Inca, rock arch and old thermal bath of the sulphur spring above the Rio de las Cuevas, near Uspallata, Mendoza Province, Argentina, South America

Strokkur Geyser, Haukadalur Valley, Golden Circle, Su√∞urland, Sudurland, Southern Iceland, Iceland, Europe

Hot spring, sinter terraces, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, viewing platform, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe

Blue water pool, Bl√°hver hot spring, Hveravellir high-temperature or geothermal region, Highlands, Iceland, Europe

Hot springs with Flamingos (Phoenicopteriformes, Phoenicopteridae) in the steaming water, Uyuni, Bolivia, South America

Krafla volcano on lake Viti, steam from a geothermal power plant, Myvatn area, Nordurland eystra, north-east region, Iceland, Europe

Hiker on a trail, hot springs and snow-capped Rhyolite Mountains, Hveradallir high temperature region, Kerlingarfjoell, highlands, Iceland, Europe

Solfataras, fumaroles, mud pools, sulfur and other minerals, steam, Hveraroend geothermal area, N√°mafjall mountains, M√Ωvatn area, Nor√∞urland eystra, the north-east region, Iceland, Europe