One World Trade Center and Lower Manhattan in New York are seen from a local park in Exchange Place, New Jersey, during the outbreak of the coronavirus disease (COVID-19), U.S. April 25, 2020. REUTERS/Eduardo Munoz 

Residents gather at their balconies to sing in tribute to healthcare workers and migrant workers during the coronavirus outbreak (COVID-19) in Singapore, April 25, 2020. REUTERS/Edgar Su TPX IMAGES OF THE DAY 

The skyline of downtown Manhattan is seen during the outbreak of the coronavirus disease (COVID-19) from the Brooklyn borough of New York City, U.S., April 24, 2020. REUTERS/Andrew Kelly 

A person in a face mask walks in front of the Manhattan skyline during the outbreak of the coronavirus disease (COVID-19) in Brooklyn borough of New York City, U.S., April 24, 2020. REUTERS/Andrew Kelly 

Residentail houses are seen on a cloudy day during the coronavirus disease (COVID-19) outbreak in Hanoi, Vietnam April 22, 2020. REUTERS/Kham 

A man rows a makeshift raft in the Yamuna river on the Earth Day, during a lockdown to slow spread of the coronavirus disease (COVID-19), in New Delhi, India, April 22, 2020. REUTERS/Anushree Fadnavis 

View of an almost deserted construction site in Brussels during the lockdown imposed by the Belgian government to slow down the coronavirus disease (COVID-19) spread, in Brussels, Belgium April 20, 2020. Picture taken April 20, 2020. REUTERS/Francois Lenoir 

The Manhattan skyline is seen during sunset from the Brooklyn borough of New York City, during the outbreak of the coronavirus disease (COVID-19), U.S., April 20, 2020. REUTERS/Brendan McDermid 

Police lines are seen to prevent people from walking near the Eiffel Tower in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, April 20, 2020. REUTERS/Charles Platiau 

Police lines are seen to prevent people from walking near the Eiffel Tower in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, April 20, 2020. REUTERS/Charles Platiau 

St Pauls cathedral and the City of London financial district are seen at dawn as the spread of coronavirus disease (COVID-19) continues in London, Britain, April 19 2020. REUTERS/John Sibley 

The city of London financial district and the river Thames are seen in early morning, as the spread of coronavirus disease (COVID-19) continues in London, Britain, April 19 2020. REUTERS/John Sibley TPX IMAGES OF THE DAY 

St Pauls cathedral and the City of London financial district are seen at dawn as the spread of coronavirus disease (COVID-19) continues in London, Britain, April 19 2020. REUTERS/John Sibley 

A view of the New York City skyline of Manhattan and the One World Trade Center during the outbreak of the coronavirus disease (COVID-19) in New York City, as seen from Weehawken, New Jersey, U.S. April 18, 2020. REUTERS/Eduardo Munoz 

People take a look at the New York City skyline of Manhattan and the Hudson River during the outbreak of the coronavirus disease (COVID-19) in New York City, as seen from Weehawken, New Jersey, U.S. April 18, 2020. REUTERS/Eduardo Munoz 

Cars pass by Paulista Avenue during a sunset, amid the coronavirus disease (COVID-19) outbreak, in Sao Paulo, Brazil, April 15, 2020. REUTERS/Rahel Patrasso 

The Pink Supermoon rises over the Shard skyscraper in London in an astronomical event that occurs when the moon is closest to the Earth in its orbit, making it appear much larger and brighter than usual, in London, Britain, April 7, 2020. REUTERS/Dylan Martinez 

The Pink Supermoon rises over the Shard skyscraper in London in an astronomical event that occurs when the moon is closest to the Earth in its orbit, making it appear much larger and brighter than usual, in London, Britain, April 7, 2020. REUTERS/Dylan Martinez 

The pink supermoon rises over the Shard skyscraper in an astronomical event that occurs when the Moon is closest to the Earth in its orbit, making it appear much larger and brighter than usual, in London, Britain, April 7, 2020. REUTERS/Dylan Martinez TPX IMAGES OF THE DAY 

The Pink Supermoon rises by the Shard skyscraper in London in an astronomical event that occurs when the moon is closest to the Earth in its orbit, making it appear much larger and brighter than usual, in London, Britain, April 7, 2020. REUTERS/Dylan Martinez 

The Pink Supermoon rises by the Boomerang skyscraper in London in an astronomical event that occurs when the moon is closest to the Earth in its orbit, making it appear much larger and brighter than usual, in London, Britain, April 7, 2020. REUTERS/Dylan Martinez 

A view of the Manhattan skyline as seen from the Linden Hill Cemetery during the outbreak of the coronavirus disease (COVID-19) in the Brooklyn borough of New York City, New York, U.S., April 6, 2020. REUTERS/Brendan Mcdermid TPX IMAGES OF THE DAY 

General view of the city of London, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 6, 2020. REUTERS/Matthew Childs 

The Eiffel tower is pictured through rain drops on a car window in Paris during a lockdown imposed to slow the spread of the coronavirus disease (COVID-19) in France, April 6, 2020. REUTERS/Gonzalo Fuentes 

A view of One World Trade Center and Manhattan from The Green-Wood Cemetery, during the outbreak coronavirus disease (COVID-19) in the Brooklyn, New York, U.S., April 3, 2020. REUTERS/Brendan McDermid 

A view of One World Trade Center and Manhattan from The Green-Wood Cemetery, during the outbreak coronavirus disease (COVID-19) in the Brooklyn, New York, U.S., April 3, 2020. REUTERS/Brendan McDermid 

An aerial view shows the deserted Champs de Mars near the Eiffel tower in Paris during a lockdown imposed to slow the spread of the coronavirus disease (COVID-19) in France, April 2, 2020. Picture taken with a drone April 2, 2020. REUTERS/Pascal Rossignol 

An aerial view shows the deserted Place de la Concorde with the Eiffel tower in the background in Paris during a lockdown imposed to slow the spread of the coronavirus disease (COVID-19) in France, April 2, 2020. Picture taken with a drone, April 2, 2020. REUTERS/Pascal Rossignol TPX IMAGES OF THE DAY 

The Shard skyscraper is seen illuminated blue in support of NHS and other key workers as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 2, 2020. REUTERS/Toby Melville 

Tower Bridge and The Shard skyscraper are seen illuminated blue in support of NHS and other key workers as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 2, 2020. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

The Shard skyscraper is seen illuminated blue in support of NHS and other key workers as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 2, 2020. REUTERS/Toby Melville 

The One World Trade Center is illuminated in red, white and blue in recognition of the ongoing nationwide effort to combat coronavirus during the outbreak of the coronavirus disease (COVID-19) in New York City, as it is seen from Exchange Place, New Jersey, U.S., March 30, 2020. REUTERS/Eduardo Munoz 

The One World Trade Center is illuminated in red, white and blue in recognition of the ongoing nationwide effort to combat coronavirus during the outbreak of the coronavirus disease (COVID-19) in New York City, as it is seen from Exchange Place, New Jersey, U.S., March 30, 2020. REUTERS/Eduardo Munoz 

The One World Trade Center is illuminated in red, white and blue in recognition of the ongoing nationwide effort to combat coronavirus during the outbreak of the coronavirus disease (COVID-19) in New York City, as it is seen from Exchange Place, New Jersey, U.S., March 30, 2020. REUTERS/Eduardo Munoz 

The One World Trade Center is illuminated in red, white and blue in recognition of the ongoing nationwide effort to combat coronavirus during the outbreak of the coronavirus disease (COVID-19) in New York City, as it is seen from Exchange Place, New Jersey, U.S., March 30, 2020. REUTERS/Eduardo Munoz 

A woman runs as the skyline of New York is seen during a foggy day from Hoboken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York City, U.S., March 29, 2020. REUTERS/Eduardo Munoz 

The sun sets behind the London skyline, as the spread of the coronavirus disease (COVID-19) continues, in London, Britain, March 25, 2020. REUTERS/Hannah McKay 

The sun sets behind the London skyline, as the spread of the coronavirus disease (COVID-19) continues, in London, Britain, March 25, 2020. REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

The Eiffel Tower is seen at sunset in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 24, 2020. REUTERS/Gonzalo Fuentes 

The Empire State Building and the skyline of New York are seen from a local park in Weehawken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York, U.S., March 22, 2020. REUTERS/Eduardo Munoz 

A view shows an empty Place de la Concord in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 22, 2020. REUTERS/Benoit Tessier 

A view shows an empty Place de la Concord in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 22, 2020. REUTERS/Benoit Tessier 

A view shows the empty Trocadero square near the Eiffel tower as a lockdown is imposed to slow the spreading of the coronavirus disease (COVID-19), in Paris, France March 18, 2020. REUTERS/Gonzalo Fuentes 

A protective face mask is seen on the pavement at the deserted Trocadero square near the Eiffel tower in Paris as a lockdown imposed to slow the rate of the coronavirus disease (COVID-19) contagion started at midday in France, France, March 17, 2020. REUTERS/Christian Hartmann 

A view shows the empty Tocadero square near the Eiffel tower in Paris as a lockdown imposed to slow the rate of the coronavirus disease (COVID-19) contagion started at midday in France, France, March 17, 2020. REUTERS/Christian Hartmann 

Skyscrapers stand in the financial district in London, Britain February 17, 2020. REUTERS/Simon Dawson 

A person wearing a face mask rides an electric scooter near bike-sharing bicycles, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 5, 2020. REUTERS/Carlos Garcia Rawlins SEARCH "CHINA GHOST" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A view of a slum is seen along a seashore in Mumbai, India, November 28, 2019. Picture taken November 28, 2019. REUTERS/Prashant Waydande 

A fisherman digs for bait in front of the Liverpool skyline on the beach at New Brighton, Britain November 19, 2019. REUTERS/Phil Noble 

A view of Havana, Cuba, October 29, 2019. Picture taken on October 29, 2019. REUTERS/Alexandre Meneghini 

A general view from the Teleferico cable car shows the city of La Paz, Bolivia, October 31, 2019. Picture taken October 31, 2019. REUTERS/Kai Pfaffenbach 

The morning sun shines on buildings and autumnal trees in an unusually hot autumn in Kiev, Ukraine October 14, 2019. Picture taken October 14, 2019. REUTERS/Gleb Garanich 

A general view of the urban landscape of Tel Aviv as most Israeli Jews refrain from driving during the 25-hour period of Yom Kippur, Israel October 9, 2019. REUTERS/Ammar Awad 

Guangzhou and the Pearl river known by its Chinese name Zhujiang is seen during sunset from the Canton Tower observation deck in Guangzhou, China, September 3, 2019. REUTERS/Jorge Silva 

A helicopter flies above an anti-government rally in Wan Chai district, Hong Kong, China, September 29, 2019. REUTERS/Jorge Silva 

A bird flies away over the East River from United Nations Headquarters during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York, U.S., September 23, 2019. REUTERS/Lucas Jackson 

Resident buildings and offices are seen in Shenzhen, Guangdong Province, China, September 6, 2019. Picture taken September 6, 2019. REUTERS/Athit Perawongmetha 

General view of Zincirlikuyu transport hub in Besiktas district is pictured in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer 

Skyscrapers of banks' headquarters and popular shopping malls are pictured next to the residential apartment blocks and Zincirlikuyu cemetery in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer 

Skyscrapers of banks' headquarters and popular shopping malls are pictured next to the residential apartment blocks and Zincirlikuyu cemetery in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer