Street side restaurant, Bangkok, Thailand

Sugar cane crusher, Martinique, Caribbean

Garden Route, Outeniqua Choo-Tjoe on Kaimaans River Bridge, South Africa

Cup of steaming coffee

Mygrata Grotogya rift fissure along divergent plate boundary with geothermal steam, North East Iceland

Cooling towers, Radcliffe on Soar Power Station, domestic housing in foreground, Trent Valley, Nottinghamshire, England, UK, Europe

Koryaksky volcano seen beyond walkers on crater rim of Avacha volcano, Kamchatka, East Siberia, Russia

Steam train, Durango & Silverton Railroad, Silverton, Colorado, USA

Senso-ji Temple, Asakusa, Tokyo, Japan

Geo-thermal power plant, Svartsengi, Iceland

Geo thermal power plant in Svartsengi (Black Field) area, Iceland

BP Chemicals' Petrochemicals Plant, Grangemouth, Falkirk, Stirlingshire, Scotland, UK

Young women with offerings, Sanur, Bali, Indonesia, Asia

Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America

Hot springs, Lake Bogoria, Kenya, East Africa, Africa

Gastown Steam Clock, the world's first steam powered clock built by Raymond Saunders, Gastown, Vancouver, British Columbia, Canada

Geothermal power plant at Svartsengi, Iceland, Polar Regions

Traditional Maori wooden carving, Whakarewarewa geothermal springs, Rotorua, South Auckland, North Island, New Zealand, Pacific

Steam train on the way to Darjeeling, West Bengal state, India, Asia

View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Drax coal fired power station, North Yorkshire, England, United Kingdom, Europe

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk in silhouette, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Time exposure of steam and stars, Villarica Volcano, Chile, South America

The colourful multi hued Champagne Pool, Wai-O-Tapu Thermal Wonderland, Waiotapu, North Island, New Zealand, Pacific

Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Sulphur encrusted fumarole at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

A steam locomotive pulling carriages through Darnholme on the North Yorkshire Steam Heritage Railway, Yorkshire, England, United Kingdom, Europe

Cold tourists on seat surrounded by steam, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Dead trees and steam with mountain backdrop and blue skies, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Southern elephant seal (Mirounga leonina) bull uses vocalisation and produces steam, Sea Lion Island, Falkland Islands, South America

Fallen lodgepole pines, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fishing Cone Geyser with freezing mists, Yellowstone Lake at West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Adding spice to the barbeque, Kunming, Yunnan, China, Asia

Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America

Neon coffee mug reflected in coffee shop window with the Pike Place Market behind, Seattle, Washington State, United States of America, North America

Steam plume from rising dome within crater, Mount St. Helens, Washington state, United States of America, North America

The Steam Clock at night on Water Street, Gastown, Vancouver, British Columbia, Canada, North America

Steam train (Toy Train) of the Darjeeling Himalayan Railway, UNESCO World Heritage Site, Batasia Loop, Darjeeling, West Bengal, India, Asia

Steam train known as the Toy Train of the Darjeeling Himalayan Railway, UNESCO World Heritage Site, en route from Darjeeling to Ghoom, Darjeeling, West Bengal, India, Asia

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

Hot Spring Pool at the Brilliant Resort and Spa in Kunming, Yunnan Province, China, Asia

Old steam engine at the final railway station of the Trans-Siberian railway in Vladivostok, Russia, Eurasia

Tibetan hot stones treatment at Chi Spa, Shangrila, Bangkok, Thailand, Southeast Asia, Asia

Hot steam bath, Kirana Spa, Bali, Indonesia, Southeast Asia, Asia

Vichy shower, Mogambo Spa at Plantation Bay, Cebu, Philippines Southeast Asia, Asia

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

Aerial view of Mount Nyiragongo, an active volcano in the Virunga Mountains in Virunga National Park, near the border with Rwanda, known for its recent devastating eruptions, Democratic Republic of the Congo, Great Rift Valley, Africa

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

Taling Chan floating market, Bangkok, Thailand, Southeast Asia, Asia

La Trochita, the Old Patagonian Express between Esquel and El Maiten in Chubut Province, Patagonia, Argentina, South America

Lobster (Homarus americanus) boiling in a steel pot, Florence, Tuscany, Italy, Europe

Woman enjoying the hot waters of the Kurokawa onsen, public spa, Kyushu, Japan, Asia

Woman enjoying the hot waters of the Kurokawa onsen, public spa, Kyushu, Japan, Asia

Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America

Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific

Noodle factory, Hsipaw, Northern Shan State, Myanmar, Asia

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

Summit of active Volcan San Cristobal, 1745m, in the North West volcano chain, the country's highest volcano, Chinandega, Nicaragua, Central America

Cooking over a camp stove near Balnakeil Bay, Sutherland, Highlands, Scotland, United Kingdom

Rusting old steam locomotive at the Train cemetery (train graveyard), Uyuni, Southwest, Bolivia, South America

Wai-O-Tapu, Rotorua, North Island, New Zealand, Pacific

Sulphur worker appearing out of toxic fumes at Kawah Ijen, East Java, Indonesia, Southeast Asia, Asia

Sulphur miner working to mine sulphur at Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Sulphur worker mining sulphur at the bottom of the crater, Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Bromo volcano crater on Java, Indonesia, Southeast Asia, Asia

Steam rising off hot geothermal pipes at dawn, Wairakei Steam Field, Taupo, North Island, New Zealand, Pacific

Active Gunung Bromo volcano at night, Bromo-Tengger-Semeru National Park, Java, Indonesia, Southeast Asia, Asia

A vintage steam train in a restoration yard with the dome of the former Parliament Building in the background, Havana, Cuba, West Indies, Caribbean, Central America

Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Jacobite steam train on the Glenfinnan Viadust on the Fort William to Mallaig Railway, Highlands, Scotland, United Kingdom, Europe

Wairakei Geothermal Power Station, Taupo, North Island, New Zealand, Pacific

Snowdon Mountain Railway train and the Llanberis path, Snowdon, Snowdonia National Park, Gwynedd, Wales; United Kingdom, Europe

Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Rusty old steam train, Ocean Harbour, South Georgia, Antarctica, Polar Regions

The very active lava lake of Mount Nyiragongo, Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa

Mount Nyiragongo looming behind the town of Goma, Democratic Republic of the Congo, Africa

Mount Nyiragongo looming behind the town of Goma, Democratic Republic of the Congo, Africa

Old Steam Sugar Locomotives, Cienfuegos City, UNESCO World Heritage Site, Cienfuegos, Cuba, West Indies, Central America

A steam locomotive at Darnholme on the North Yorkshire Railway line travelling from Whitby to Pickering, Yorkshire, England, United Kingdom, Europe

Glenfinnan Railway Viaduct, part of the West Highland Line, Glenfinnan, Loch Shiel, Highlands, Scotland, United Kingdom, Europe

A wintery scene of the Glenfinnan Railway Viaduct with steam locomotive, Highlands, Scotland, United Kingdom, Europe

Old Patagonian Express La Trochita, steam train, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Esquel Train Station, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Esquel Train Station, Chubut Province, Patagonia, Argentina, South America

Old Patagonian Express La Trochita, steam train, Chubut Province, Patagonia, Argentina, South America

The Champagne Pool, Wai-o-tapu Thermal Wonderland, geothermal area, Waiotapu, Rotorua, North Island, New Zealand, Pacific

Szechenyi Thermal Baths at night, Budapest, Hungary, Europe

Pilgrims queuing to bathe in the sacred Tampaksiring Spring, Pura Tirta Empul Temple, Ubud, Bali, Indonesia, Southeast Asia, Asia

Rusting steam locomotive, 'Cementerios de los trenes', Uyuni, Bolivia, South America

Steaming baskets on wok, Leshan, Sichuan, China, Asia

The great geyser Geysir, now dormant (2008), with the more active Strokkur geyser erupting in the distance, Geysir, Haukadalur valley, Golden Circle, Iceland, Polar Regions

Sulphur river below Volcano Tavurvur, Rabaul, East New Britain, Papua New Guinea, Pacific