An airplane flies over a Travelodge hotel at Heathrow Airport, amid the coronavirus disease (COVID-19) pandemic, in London, Britain, February 12, 2021. REUTERS/Peter Cziborra

An airplane flies over a Travelodge hotel at Heathrow Airport, amid the coronavirus disease (COVID-19) pandemic, in London, Britain, February 12, 2021. REUTERS/Peter Cziborra

An airplane flies over a Travelodge hotel at Heathrow Airport, amid the coronavirus disease (COVID-19) pandemic, in London, Britain, February 12, 2021. REUTERS/Peter Cziborra

An airplane flies over a Travelodge hotel at Heathrow Airport, amid the coronavirus disease (COVID-19) pandemic, in London, Britain, February 12, 2021. REUTERS/Peter Cziborra

A woman rides horse-shaped ice sculpture iduring the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

The moon rises over ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT)

A woman looks for space to hang her red ribbon bearing her wish on an ice sculpture illuminated by coloured light during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People heading to the 31st Harbin International Ice and Snow Festival venue are silhouetted against ice sculptures illuminated by coloured lights at its opening day in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY TPX IMAGES OF THE DAY SOCIETY TRAVEL)

People visit ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People visit ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People ride slides on ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY TRAVEL SOCIETY TPX IMAGES OF THE DAY)

A woman takes her souvenir picture with a white fox in front of ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ANIMALS TRAVEL TPX IMAGES OF THE DAY)

Children ride a slide on ice sculptures illuminated by coloured lights during the opening day of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments, kicked off on Monday in Harbin, one of the coldest cities in China.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

Tourists sit on a horse-drawn carriage in front of ice sculptures illuminated by coloured lights, during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY ENVIRONMENT SOCIETY TRAVEL)

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People visit ice sculptures illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

A man rides a slide on an ice sculpture illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY)

People visit a maze which was built with ice bricks and illuminated by coloured lights during a trial operation ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY TPX IMAGES OF THE DAY)

Visitors look around ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL)

A visitor has his picture taken with a piano-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL)

Visitors use kaleidoscopes which are displayed with ice sculptures ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL TPX IMAGES OF THE DAY)

A woman rides a slide on an ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL)

Visitors walk past a train-shaped ice sculpture ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL)

A visitor makes her way in a maze which is made by ice bricks ahead of the 31st Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2015. The winter festival will be officially opened on January 5, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ANNIVERSARY SOCIETY ENVIRONMENT TRAVEL)

Tourists play with a ball on the beach on a sunny day at Valras-Plage, southern France December 31, 2014. REUTERS/Yves Herman (FRANCE - Tags: ENVIRONMENT SOCIETY)

Signs are covered in snow and ice on the peak of the Feldberg mountain as people enjoy the winter weather at the last day of the year, 20km outside of Frankfurt, December 31, 2014. REUTERS/Kai Pfaffenbach (GERMANY - Tags: SOCIETY ENVIRONMENT)

Fireworks light up the Sydney Harbour Bridge during the annual fireworks display to usher in the new year, early January 1, 2015. More than 10,000 aerial fireworks, 25,000 shooting comets and 100,000 pyrotechnic effects were used during the annual Sydney Harbour New Year's Eve show, with an estimated 1.6 million people watching from along the harbour foreshore, local media reported. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY ANNIVERSARY TPX IMAGES OF THE DAY)

A man sells traditional doll toys and sweets for children to celebrate the birthday of prophet Muhammad, also known as "mawlid al nabi", which will fall next week, in a makeshift tent in Cairo, December 30, 2014. REUTERS /Mohamed Abd El Ghany (EGYPT - Tags: RELIGION SOCIETY)

A view of the city is seen on a frosty morning in Primrose Hill north in London December 30, 2014. REUTERS/Neil Hall (BRITAIN - Tags: ENVIRONMENT SOCIETY)

A man walks a dog on a frosty morning in Primrose Hill in north London December 30, 2014. REUTERS/Neil Hall (BRITAIN - Tags: ENVIRONMENT SOCIETY)

A man walks along a frosty path in Primrose Hill in north London December 30, 2014. REUTERS/Neil Hall (BRITAIN - Tags: ENVIRONMENT SOCIETY)

A view of the city is seen from Primrose Hill on a frosty morning in London December 30, 2014. REUTERS/Neil Hall (BRITAIN - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

Vladimir Shcherba, 53, a fan of winter swimming, enters to the Yenisei River at air temperature some minus 23 degrees Celsius (-9 Fahrenheit), in Russia's Siberian city of Krasnoyarsk, December 30, 2014. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENVIRONMENT SOCIETY)

Vladimir Shcherba, 53, a fan of winter swimming, dips to the Yenisei River at air temperature some minus 23 degrees Celsius (-9 Fahrenheit), in Russia's Siberian city of Krasnoyarsk, December 30, 2014. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

A man walks through Victoria Park at sunrise in Leicester, central England, December 30, 2014. REUTERS/Darren Staples (BRITAIN - Tags: ENVIRONMENT SOCIETY)

A woman runs through Victoria Park at sunrise in Leicester, central England, December 30, 2014. REUTERS/Darren Staples (BRITAIN - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

Kashmiri fishermen cover their heads and part of their boats with blankets and straw as they wait to catch fish in the waters of the Anchar Lake on a cold winter day in Srinagar December 30, 2014. The fishermen use the blankets and straw to prevent light from entering through the water, which according to them helps in the catching of fish.
REUTERS/Danish Ismail (INDIAN-ADMINISTERED KASHMIR - Tags: SOCIETY ENVIRONMENT)

Kashmiri fishermen use spears to catch fishes in the waters of the Anchar Lake on a cold winter day in Srinagar December 30, 2014. REUTERS/Danish Ismail (INDIAN-ADMINISTERED KASHMIR - Tags: SOCIETY ENVIRONMENT)

A woman walks with her dog on the beach at the sunset in Valras-Plage, southern France December 29, 2014. REUTERS/Yves Herman (FRANCE - Tags: ENVIRONMENT SOCIETY)

People walk in Dunham park near Altrincham, northern England December 29, 2014. REUTERS/Phil Noble (BRITAIN - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

People walk in front of the snow covered city skyline with the radio transmission tower in Berlin December 29, 2014. REUTERS/Fabrizio Bensch (GERMANY - Tags: ENVIRONMENT SOCIETY CITYSCAPE)

Sheikh Abdulla, a blind man, uses his stick to climb to a mosque inside the old city, Shali, where he works as an Imam, November 25, 2014. Residents of Siwa have been hurt by declining tourism in Egypt, which received 9.5 million tourists last year, down from over 14.7 million tourists in 2010, before the uprising that ousted autocrat Hosni Mubarak. Nationwide, the situation is gradually improving and the government says tourism could recover to pre-crisis levels next year if regional turmoil spares Egypt. But Siwa, located just 50 km (30 miles) from war-torn Libya, still sees only a fraction of the tourists that once visited the desert oasis, the head of Siwa's tourism authority says. REUTERS/Asmaa Waguih (EGYPT - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY TRAVEL)

ATTENTION EDITORS: PICTURE 03 OF 20 FOR WIDER IMAGE PACKAGE 'HIDDEN FROM EGYPT'S CROWDED CITIES'.

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A man stands on a small bridge over the salt lake at a farm near the Salinas of Siwa November 22, 2014. Situated about 17 meters below sea level, Siwa faces problems of salt water flooding the land. Residents of Siwa have been hurt by declining tourism in Egypt, which received 9.5 million tourists last year, down from over 14.7 million tourists in 2010, before the uprising that ousted autocrat Hosni Mubarak. Nationwide, the situation is gradually improving and the government says tourism could recover to pre-crisis levels next year if regional turmoil spares Egypt. But Siwa, located just 50 km (30 miles) from war-torn Libya, still sees only a fraction of the tourists that once visited the desert oasis, the head of Siwa's tourism authority says. REUTERS/Asmaa Waguih (EGYPT - Tags: SOCIETY TRAVEL TPX IMAGES OF THE DAY)

ATTENTION EDITORS: PICTURE 02 OF 20 FOR WIDER IMAGE PACKAGE 'HIDDEN FROM EGYPT'S CROWDED CITIES'. TO FIND ALL IMAGES SEARCH 'SIWA ASMAA'

People walk on the beach on a sunny day at Narbonne Plage, southern France December 28, 2014. The town, which welcomes thousands of tourists in summer, gets few visitors in winter period.
REUTERS/Yves Herman (FRANCE - Tags: ENVIRONMENT SOCIETY TRAVEL)

A woman walks on a wall next to the beach on a sunny day at Narbonne Plage, southern France December 28, 2014. The town, which welcomes thousands of tourists in summer, gets few visitors in winter period.
REUTERS/Yves Herman (FRANCE - Tags: ENVIRONMENT SOCIETY TRAVEL)

Members of the "Cryophil" winter swimming club run along the Yenisei River ahead of New Year and Christmas celebrations, with the air temperature at about minus 8 degrees Celsius (17.6 degrees Fahrenheit), outside Russia's Siberian city of Krasnoyarsk, December 28, 2014. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY ENVIRONMENT)

Geese and ducks are pictured at the Bois de la Cambre during the first snowfall in Brussels December 27, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ANIMALS SOCIETY ENVIRONMENT)

People sledge in a snow covered park in Sheffield, northern England December 27, 2014. Motorists in the north of Britain were trapped overnight, as a result of heavy snowfalls, local media reported. REUTERS/Phil Noble (BRITAIN - Tags: ENVIRONMENT)

People sledge in a snow covered park in Sheffield, northern England December 27, 2014. Motorists in the north of Britain were trapped overnight, as a result of heavy snowfalls, local media reported. REUTERS/Phil Noble (BRITAIN - Tags: ENVIRONMENT)

Artificial snow making machines operate on grass-covered slopes at the ski station at Les Gets in the French Alps December 26, 2014. Meteo France weather service predicts snowfall in France over the weekend according to media reports. REUTERS/Gonzalo Fuentes (FRANCE - Tags: ENVIRONMENT TRAVEL)

A woman reacts after a heavy snowfall in central Moscow, December 25, 2014. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT CITYSCAPE TPX IMAGES OF THE DAY)

A boy slides from the top of a heap of snow in the Red Square, with St. Basil's Cathedral seen in the background, in central Moscow December 25, 2014. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT CITYSCAPE TPX IMAGES OF THE DAY)

A boy stands on top of a heap of snow in the Red Square, with St. Basil's Cathedral seen in the background, in central Moscow December 25, 2014. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT CITYSCAPE)

Boys play with snow by the Kremlin walls in central Moscow, December 25, 2014. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

A worker rests as he clears and removes snow in Red Square, with St. Basil's Cathedral (L) and the mausoleum of Soviet state founder Vladimir Lenin seen in the background, in central Moscow, December 25, 2014. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT SOCIETY CITYSCAPE)

Flowers are seen on the beach in Seenigama December 20, 2014. More than 250,000 people died in the tsunami on December 26, 2004, which was triggered by a 9.0-magnitude earthquake off the coast of Indonesia's Sumatra island. Indonesia bore the brunt, but Sri Lanka was the next worst-affected country with a death toll of about 40,000. Seenigama, about 110 km (70 miles) south of the island nation's capital, Colombo, was hit particularly hard by the tsunami because reefs that might have shielded it had been destroyed by years of coral mining. Picture taken December 20,2014. To match Feature TSUNAMI-ANNIVERSARY/SRILANKA REUTERS/Dinuka Liyanawatte (SRI LANKA - Tags: DISASTER ENVIRONMENT ANNIVERSARY)

An airplane is pictured though a rain-coated window on the day before Christmas at LaGuardia Airport in New York, December 24, 2014. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY TRANSPORT ENVIRONMENT)

An exterior view of the Confluences Musee is seen on the southern tip of the peninsula where the Rhone and Saone rivers join in Lyon December 23, 2014. The museum, which opened December 20, includes collections of natural science, anthropology and Earth Sciences from the Guimet Natural History Museum. Austrian architects Coop Himmelb(l)au designed the museum. Picture taken December 23, 2014. REUTERS/Robert Pratta/Coop Himmelb(l)au Architects (FRANCE - Tags: SOCIETY TPX IMAGES OF THE DAY)