A surfer walks into the Pacific Ocean at sunrise on the 50th anniversary of Earth Day, as the global outbreak of coronavirus disease (COVID-19) continues, in Huntington Beach, California, U.S., April 22, 2020. REUTERS/Lucy Nicholson 

A surfer paddles into the Pacific Ocean at sunrise on the 50th anniversary of Earth Day, as the global outbreak of coronavirus disease (COVID-19) continues, in Huntington Beach, California, U.S., April 22, 2020. REUTERS/Lucy Nicholson 

A surfer walks into the Pacific Ocean at sunrise on the 50th anniversary of Earth Day, as the global outbreak of coronavirus disease (COVID-19) continues, in Huntington Beach, California, U.S., April 22, 2020. REUTERS/Lucy Nicholson 

A woman waits to receive free protective masks that have been bought by evangelicals in China and are distributed by Members of the Evangelical Christian Church, as the spread of the coronavirus disease (COVID-19) continues, in Rome, April 22, 2020. REUTERS/Yara Nardii 

A farmer carries chrysanthemum flowers from his field for sale during the coronavirus disease (COVID-19) outbreak in Hanoi, Vietnam April 22, 2020. REUTERS/Kham 

A health official removes the protective gear after collecting samples from people at a fish market during the curfew amid concerns about the spread of the coronavirus disease (COVID-19), in Colombo, Sri Lanka, April 22, 2020. REUTERS/Dinuka Liyanawatte 

A man who is living in the New York subway system sleeps in a relatively empty station as the outbreak of the coronavirus continues in the subways of New York, U.S., April 13, 2020. Picture taken April 13, 2020. REUTERS/Lucas Jackson To match Special Report HEALTH-CORONAVIRUS/NEWYORK-HOMELESS 

A red fox stands in an empty park in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 19, 2020. Picture taken on April 19, 2020. REUTERS/ Amir Cohen 

A red fox walks in an empty park in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 19, 2020. Picture taken on April 19, 2020. REUTERS/ Amir Cohen 

A red fox runs near the seashore in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 19, 2020. Picture taken on April 19, 2020. REUTERS/ Amir Cohen 

A red fox stands on an empty skate park in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 19, 2020. Picture taken on April 19, 2020. REUTERS/ Amir Cohen 

A red fox surveys the seashore in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 17, 2020. Picture taken on April 17, 2020. REUTERS/ Amir Cohen 

A red fox stands at an empty park in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 21, 2020. Picture taken on April 21, 2020. REUTERS/ Amir Cohen 

A red fox surveys the seashore in the southern Israeli city of Ashkelon, where predatory animals now roam amid the coronavirus disease (COVID-19) restrictions that have closed beaches and emptied sidewalks April 17, 2020. Picture taken on April 17, 2020 REUTERS/ Amir Cohen 

A lone pedestrian walks across the pedestrian bridge at the U.S.-Mexico border during the coronavirus disease (COVID-19) outbreak in San Diego, California, U.S., April 21, 2020. REUTERS/Mike Blake 

A woman takes a picture during sunset after the Austrian government loosened its lockdown restrictions during the coronavirus disease (COVID-19) outbreak in Maria Plain, Austria, April 21, 2020. REUTERS/Leonhard Foeger 

A man exercises during the coronavirus disease (COVID-19) outbreak, in Chon Buri province, east of Bangkok, Thailand April 21, 2020. REUTERS/Soe Zeya Tun 

A member of the Iraqi security forces stands guard at an oil burner in al-Zubair oil field, near Basra, Iraq April 21, 2020. REUTERS/Essam al-Sudani 

A crow is rest on a branch of a tree that has shed its leaves ahead of Earth Day, amid concerns about the spread of coronavirus disease (COVID-19) in Colombo,Sri Lanka April 21, 2020. REUTERS/Dinuka Liyanawatte 

An elk knees as it eats rape in a field near the village of Zhukovka, Belarus April 20, 2020. Picture taken April 20, 2020. REUTERS/Vasily Fedosenko 

A jay eats corn in a field near the village of Zhukovka, Belarus April 21, 2020. REUTERS/Vasily Fedosenko 

A black woodpecker flies over a field near the village of Zhukovka, Belarus April 21, 2020. REUTERS/Vasily Fedosenko 

An elderly person walks by Avon Beach in Christchurch, as the spread of the coronavirus disease (COVID-19) continues, Christchurch, Britain, April 21, 2020. REUTERS/Paul Childs 

A farmworker harvests strawberries in a glasshouse as farmers struggle to find workers due to the coronavirus lockdown in Wepion, Belgium April 20, 2020. Picture taken April 20, 2020. REUTERS/Johanna Geron 

A farm worker picks asparagus during the coronavirus disease (COVID-19) outbreak in Torre del Burgo, Spain, April 20, 2020. Picture taken April 20, 2020. REUTERS/Juan Medina 

A seal is seen near the beach at Barton on Sea, Hampshire as the spread of the coronavirus disease (COVID-19) continues, Barton on Sea, Britain, April 21, 2020. REUTERS/Paul Childs 

The Houses of Parliament and Big Ben are seen by the silhouette of a man from across the River Thames ahead of Parliament reopening while the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 21, 2020. REUTERS/Peter Nicholls 

A migrant worker is pictured at a dormitory declared as an isolation area, during the coronavirus outbreak (COVID-19) in Singapore April 21, 2020. REUTERS/Edgar Su 

A cat is pictured in the corridor of the students' residence amid an outbreak of the coronavirus disease (COVID-19) in Dakar, Senegal April 14, 2020. Picture taken April 14, 2020. REUTERS/Zohra Bensemra 

A protester holds placards during protest against the state's extended stay-at-home order to help slow the spread of the coronavirus disease (COVID-19) at the Capitol building in Columbus, Ohio, U.S., April 20, 2020. REUTERS/Seth Herald 

A police officer wearing a protective face mask sits next to barricades placed there to ensure people abide by restrictions during the national holiday of Sham el-Nessim marking the beginning of spring season, with almost empty streets to contain the spread of the coronavirus disease (COVID-19) in Cairo, Egypt April 20, 2020. REUTERS/Amr Abdallah Dalsh 

A resident sunbathes at his window apartment during a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, April 20, 2020. REUTERS/Charles Platiau 

A volunteer wearing protective gear sprays disinfectant during the coronavirus disease (COVID-19) outbreak at a community near Hua Lamphong train station in Bangkok, Thailand, April 20, 2020. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY 

A woman walks past damaged buildings with her child in the rebel-held Idlib city, Syria April 19, 2020. Picture taken April 19, 2020. REUTERS/Khalil Ashawi 

A migrant worker walks among foundation pilings to spray oil on stagnant water to prevent mosquito breeding at a construction site that has stopped work since the "circuit breaker" measures to curb the coronavirus disease (COVID-19) outbreak in Singapore April 20, 2020. REUTERS/Edgar Su 

A boy holds a toy assault rifle as hundreds gather to protest against the state's extended stay-at-home order to help slow the spread of the coronavirus disease (COVID-19) at the Capitol building in Olympia, Washington, U.S. April 19, 2020. REUTERS/Lindsey Wasson 

A goat chews on the stem of a banana plant outside a closed shop, during a nationwide lockdown in India to slow the spread of COVID-19, in Dharavi, one of Asia's largest slums, during the coronavirus disease outbreak, in Mumbai, India, April 10, 2020. REUTERS/Francis Mascarenhas SEARCH "CORONAVIRUS MUMBAI SLUM" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A person rides a bike during the sunset at the Tempelhofer Feld, as the spread of coronavirus disease (COVID-19) continues in Berlin, Germany, April 19, 2020. REUTERS/Christian Mang 

Pebble sculptures are seen on Whitley Bay beach, as the spread of the coronavirus disease (COVID-19) continues, Whitley Bay, Britain, April 19, 2020. REUTERS/Lee Smith 

A man is silhouetted as he stands at the door of a house during the twenty-seventh day of the lockdown imposed by the government amid concerns about the spread of coronavirus disease at a park in Kathmandu, Nepal April 19, 2020. REUTERS/Navesh Chitrakar 

A police officer prays during the Orthodox Easter celebrations at the Three Saints Cathedral amid the coronavirus disease (COVID-19) outbreak in the village of Leningradskaya in Krasnodar Region, Russia April 19, 2020. REUTERS/Sergey Pivovarov 

Pebble sculptures are seen on Whitley Bay beach, as the spread of the coronavirus disease (COVID-19) continues, Whitley Bay, Britain, April 19, 2020. REUTERS/Lee Smith 

A man runs up steps in Liverpool, as the spread of the coronavirus disease (COVID-19) continues, Liverpool, Britain, April 19, 2020. REUTERS/Phil Noble TPX IMAGES OF THE DAY 

A man waits to cross a street in front of Shinjuku station, a normally crowded street during the weekend, after the government expanded a state of emergency to include the entire country last week following the coronavirus disease (COVID-19) outbreak, in Tokyo, Japan, April 19, 2020. Picture taken with a drone. REUTERS/Kim Kyung-Hoon 

A believer wearing a protective face mask, used as a preventive measure against the coronavirus disease (COVID-19), prays near a cathedral of the Ukrainian Greek Catholic Church during the Orthodox Easter celebrations in Kiev, Ukraine April 19, 2020. REUTERS/Valentyn Ogirenko 

A dog is walked on the beach in Blyth as the spread of the coronavirus disease (COVID-19) continues in Britain, April 19, 2020. REUTERS/Lee Smith TPX IMAGES OF THE DAY 

A person walks on the beach in Tynemouth, as the spread of the coronavirus disease (COVID-19) continues, in Britain, April 19, 2020. REUTERS/Lee Smith 

A woman holds a sign as protesters against the state's extended stay-at-home order to help slow the spread of the coronavirus disease (COVID-19) demonstrate at the Capitol building in Austin, Texas, U.S., April 18, 2020. REUTERS/Callaghan O'Hare 

An Orthodox Christian worshipper holds candles-stick with fire following The Holy Fire ceremony that took place in the Church of the Holy Sepulchre in Jerusalem's Old City amid the coronavirus disease (COVID-19) outbreak April 18, 2020 REUTERS/Ammar Awad 

Disposable gloves are seen on the ground amid the coronavirus disease (COVID-19) outbreak in Madrid, Spain, April 18, 2020. REUTERS/Susana Vera 

A health official arrives to collect samples from villagers during the curfew amid concerns about the spread of coronavirus disease (COVID-19), in Colombo, Sri Lanka, April 18, 2020. REUTERS/Dinuka Liyanawatte 

A worker fumigates an apartment amidst the outbreak of the coronavirus disease (COVID-19), in Guayaquil, Ecuador April 17, 2020. REUTERS/Vicente Gaibor del Pino 

A worker fumigates an apartment amidst the outbreak of the coronavirus disease (COVID-19), in Guayaquil, Ecuador April 17, 2020. REUTERS/Vicente Gaibor del Pino 

A priest holds a cross during the Good Friday Epitaph procession, taking place behind closed doors as part of measures to contain the spread of the coronavirus disease (COVID-19), at the Patriarchal Cathedral of St. George in Istanbul, Turkey, April 17, 2020. Emrah Gurel/Pool via REUTERS 

A bird flies in Ammiq Wetland, in Lebanon's eastern Bekaa valley, Lebanon April 14, 2020. Picture taken April 14, 2020. REUTERS/Ali Hashisho 

A squacco heron (Ardeola ralloides) is pictured in Ammiq Wetland, in Lebanon's eastern Bekaa valley, Lebanon April 14, 2020. Picture taken April 14, 2020. REUTERS/Ali Hashisho 

A believer prays inside St. Marko's church on the day that Serbian Orthodox church celebrate Good Friday amid the coronavirus disease (COVID-19) outbreak, in Belgrade, Serbia, April 17, 2020. REUTERS/Marko Djurica 

A man walks along an empty parking lot in downtown New Orleans as the spread of coronavirus disease (COVID-19) continues, in New Orleans, Louisiana U.S., April 16, 2020. REUTERS/Carlos Barria 

People pose for a picture on a field with blooming Tulips during the spread of the coronavirus disease (COVID-19) in Grevenbroich, Germany, April 16, 2020. REUTERS/Thilo Schmuelgen 

Tulips bloom on a field during the spread of the coronavirus disease (COVID-19) in Grevenbroich, Germany, April 16, 2020. REUTERS/Thilo Schmuelgen