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The Li River and forested limestone karst formations in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The Li River and forested limestone karst formations in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The Li River and forested limestone karst formations in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Detail of vegetation growing on the limestone cliffs along the Li River in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A foggy morning view of the ancient town of Fenghuang from the old city wall. China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Cormorants on a raft in the Tuojiang River with the city of Fenghuang lit up at night. China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A bamboo forest growing along the bank of the Li River in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A traditional broom made of small branches leaning against a building in the Hunan Province of China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The Wanming Pagoda in the ancient town of Fenghuang at night. China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Lysimachia kwangtungensis has no common name. It is a perennial flowering herb native to China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Lysimachia kwangtungensis has no common name. It is a perennial flowering herb native to China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The dichotomy of a modern satellite dish on an old traditional farm house in a small town in rural China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Chinese tourists crossing Tiananmen Square in the rain. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Early morning fog in the Mutianyu Valley below the Great Wall of China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The cable car to carry tourists from Mutianyu to the Great Wall in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Bavarian forest in autumn. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan Bridge. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan Bridge. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Buildings in the Financial district. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan Bridge at night. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Times square at dusk. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Frisay market in Union square. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Frisay market in Union square. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Madison square. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Empire State Building. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Grand Central station. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The ornate gate into Beihai Park with the White Dagoba in the background. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The White Dagoba or Bai Ta stupa and ShanYin Pavilion in Beihai Park in Bejing,. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Detail of a Chinese lion dance mask used for celebrating the Chinese New Year. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Chinese tourists below the cable car to the Great Wall on the ridge above Mutinayu in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Chinese tourists below the cable car to the Great Wall on the ridge above Mutinayu in China. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Detail of the Communist symbols over the entrance to the National Museum of China with the moon. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Bedouin family in a traditional tent. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Exterior view of the Guggenheim museum. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Brooklyn bank in the mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Brooklyn bridge through a window. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan bridge in the morning mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan bridge in the morning mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Manhattan bridge in the morning mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Manhattan and the Freedom Tower. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A cityscape of Manhattan skyline and Brooklyn bridge. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Freedom Tower from Battery place. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Wall street sign in New York Financial district. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Broadway sign in New York Financial district. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

FDNY 14 Engine fire fighters quarter. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

FDNY 14 Engine fire fighters quarter. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of the Flatiron building in Madison square. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of the Flatiron building in Madison square. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A View of Manhattan from Empire State Building. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A View of Manhattan from Empire State Building. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

People walking on a New York City subway station. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

People playing music in the subway. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A cityscape of downtown Beijing with the Wanchun Pavilion on Coal Hill in Jingshan Park at left. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A view of New York City skyline from Jacqueline Kennedy Reservoir in Central Park. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The New York Knicks versus the Phoenix suns during an NBA match at Madison Square Garden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of New York City skyline in the morning mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Brooklyn bridge and New York City skyline in the morning mist. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of the Manhattan bridge from Washington street in Brooklyn. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Battery Park City and the Freedom Tower at World Trade Center. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Battery Park City and the Freedom Tower at World Trade Center. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan skyline and the Brooklyn bridge in the mist at dusk. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Manhattan skyline and the Brooklyn bridge in the mist at dusk. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A View of Manhattan and Chrysler Building from the roof of Empire State Building. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

And off road vehicle drives on sand dunes of the Erg Awbari. Libya. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Ice formations covered by snow at Tornetrask Lake. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Acacia tree at sunrise. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Joshua Tree NP. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

V & A Waterfront at dusk. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Lemaire channel in Antarctica. Antarctica. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Lemaire channel in Antarctica. Antarctica. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Service crew by a partially disassembled blowout preventer on an oil well head undergoing intervention. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An oil storage tank battery and separating equipment on an oil well location in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Separators and a crude oil storage tank battery on an oil well location in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A conventional horsehead oil well pump jack unit on an oil well site in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig telescoped down prior to moving to another oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folding down prior to moving to another oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folding down prior to moving to another oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A partially disassembled blowout preventer on an oil well head undergoing intervention. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil collection pipeline in an oil field in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil collection pipeline in an oil field in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil collection pipeline in an oil field in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil collection pipeline in an oil field in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folding up on an oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folding up on an oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Hydraulic oil well pumping unit being set down with a telehandler after removal from the wellhead. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The traveling block on a portable truck-mounted oil well service workover rig in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The traveling block on a portable truck-mounted oil well service workover rig in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid tanker carrying acid for acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid pump truck for pumping acid down an oil well to dissolve deposite impeding production. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid pump truck for pumping acid down an oil well to dissolve deposite impeding production. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid tanker carrying acid for acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid tanker and pumper truck for acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid pump truck for pumping acid down an oil well to dissolve deposite impeding production. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An acid tanker and pumper truck acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The blowout preventer is a safety device attached to the wellhead during certain maintenance work. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

Sunset on the Grey Lake. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The Grey glacier and Grey Lake. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Sunset over Torres del Paine. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Frozen Tornetrask Lake in Sweden. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Landscape view of frozen Tornetrask Lake. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A Frozen waterfall in Sweden. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Salt crust in tyhe Badwater Basin. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Zabriskie Point. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

An emprty road in Joshua Tree NP. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Low angle view of Aurora borealis at night. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A colorful house in Cerro Alegre District. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A horse grazes along the Li River near Guilin

A foggy morning on the Li River near Yangshou

A foggy morning on the Li River near Yangshou

An aerial view of West Falkland island. Falkland Islands. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

An aerial view of West Falkland island. Falkland Islands. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

An aerial view of West Falkland island. Falkland Islands. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The plains of Masai Mara dotted by acacia trees. Kenya. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Lago del Toro and Torres del Paine at sunset. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of laguna Amarga at sunrise. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of laguna Amarga at sunrise. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Torres del Paine from Laguna Amarga at sunrise. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Clouds over Lago Pehoe and Los Cuernos del Paine. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of the granite towers of Cuernos del Paine. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Icebergs floating in the Grey Lake with Torres del Paine in the background. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The granite towers of Cuernos del Paine. Ultima Esperanza Chile. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Low angle view of trees in Bavarian Forest National Park. Germany. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

Detail of Ice stalactites along the bank of Tornetrask Lake. Sweden. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A landscape of Badwater Basin in the Death Valley. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A landscape of Badwater Basin in the Death Valley. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A canyon along the Artist Drive road in the Death Valley NP. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The 'Artist's Palette'in the Death Valley NP. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of Cholla Cactus Garden at sunset. California USA. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A view of V & A Waterfront and Table mountain in the background. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

An empty road leading to Cape of Good Hope Cape Town Western Cape South Africa. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

An empty road leading to Cape of Good Hope Cape Town Western Cape South Africa. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

The derrickman being lowered to the ground by his safety harness on an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil storage tank battery for collecting oil from wells before transporting by truck to a refinery. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A crude oil storage tank battery for collecting oil from wells before transporting by truck to a refinery. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a pulling unit or workover rig works on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig providing maintenance on an oil well in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig providing maintenance on an oil well in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig providing maintenance on an oil well in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig providing maintenance on an oil well in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A conventional horsehead oil well pump jack unit and heater treaters on an oil well site in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An hydraulic pumping unit on an oil well in Utah. Behind are the La Sal Mountains with new snow. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An hydraulic pumping unit on an oil well in Utah. Behind are the La Sal Mountains with new snow. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A rack of oil field pipe with a workover rig or pulling unit in the background at an oil well silte. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the La Sal Mountains & Behind the Rocks. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a pulling unit or workover rig works on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A conventional horsehead oil well pump jack unit and storage tank battery on an oil well site in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew picks up the rear load beam for a workover rig with a telehandler on a oil well site. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folded down prior to setting up on an oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig folded down prior to setting up on an oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A telescoping truck-mounted workover rig telescoping up to full length on a new oil well location. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A well service hand on top of a hydraulic pumping unit prepares to attach the traveling block to the unit. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A well service hand on top of a hydraulic pumping unit prepares to attach the traveling block to the unit. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A well service hand on top of a hydraulic pumping unit prepares to attach the traveling block to the unit. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A long stroke belt pump and a traditional pump jack on adjacent oil wells in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A long stroke belt pump and a traditional pump jack on adjacent oil wells in the canyon country of Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A long stroke belt driven pump on an oil well in Utah. Behind is a tank battery or temporty oil storage tanks. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A heating tank for heating very viscous crude oil to make it easier to pump into a transport truck. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig connects the hoses for a hot oil treatment on an oil well. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The operator on a well service workover rig running the controls on the rig on an oil well. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The operator on a well service workover rig running the controls on the rig on an oil well. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The derrickhand or derrickman working in the rod basket on the mast of an oil field workover rig. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A workover rig with an acid tanker and pumper truck acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A workover rig with an acid tanker and pumper truck acidizing an oil well to restore production. Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A pulling unit or workover rig on an oil well in Utah. Behind are the Monitor & Merrimac Buttes & Book Cliffs. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig uses power tongs to reconnect the sections of tubing on an oil well. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

The well service crew on a workover rig works on an oil well to try to bring it back into service. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A derrickman or derrickhand on the tubing board on the mast of a workover rig on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

An oil well service workover rig placing tubing or pipe back into an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A derrickman or derrickhand on the tubing board on the mast of a workover rig on an oil well in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A derrickman or derrickhand on the tubing board of a workover rig on an oil well site in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A derrickman or derrickhand on the tubing board of a workover rig on an oil well site in Utah. (Photo by: Jon G. Fuller / VWPics/Universal Images Group via Getty Images)

A baobab tree at twilight. Botswana. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A baobab tree at twilight. Botswana. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)

A dead tree at sunset. Botswana. (Photo by: Sergio Pitamitz / VWPics/Universal Images Group via Getty Images)