Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the Victory Day parade in Moscow, Russia June 20, 2020. The military parade marking the 75th anniversary of the victory over Nazi Germany in World War Two was planned for May 9 and postponed due to the outbreak of the coronavirus disease (COVID-19). REUTERS/Maxim Shemetov 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the Victory Day parade in Moscow, Russia June 20, 2020. The military parade marking the 75th anniversary of the victory over Nazi Germany in World War Two was planned for May 9 and postponed due to the outbreak of the coronavirus disease (COVID-19). REUTERS/Evgenia Novozhenina 

Trail smoke hangs in the sky from the aerobatic demonstration team of the Italian Air Force, The Frecce Tricolori ("Tricolor Arrows"), after performing over the city on the Republic Day holiday to show unity and solidarity following the outbreak of the coronavirus disease (COVID-19), ending a tour of the country, as seen from the Spanish Steps in Rome, Italy, June 2, 2020. REUTERS/Remo Casilli 

Nissan logo is seen amid the smoke rising from burning tires during a workers' protest in front of the Barcelona factory against the possible closure of the plant at Zona Franca, during the coronavirus disease (COVID-19) outbreak in Barcelona, Spain, May 28, 2020. REUTERS/Albert Gea 

Nissan logo is seen amid the smoke rising from burning tires during a workers' protest in front of the Barcelona factory against the possible closure of the plant at Zona Franca, during the coronavirus disease (COVID-19) outbreak in Barcelona, Spain, May 28, 2020. REUTERS/Albert Gea 

Nissan logo is seen amid the smoke rising from burning tires during a workers' protest in front of the Barcelona factory against the possible closure of the plant at Zona Franca, during the coronavirus disease (COVID-19) outbreak in Barcelona, Spain, May 28, 2020. REUTERS/Albert Gea 

Su-25 jet aircraft release smoke in the colours of the Russian state flag above St. Basil's Cathedral during an air parade on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in central Moscow, Russia May 9, 2020. REUTERS/Maxim Shemetov 

Su-25 jet aircraft release smoke in the colours of the Russian state flag above Red Square during an air parade on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in central Moscow, Russia May 9, 2020. REUTERS/Shamil Zhumatov 

Su-25 jet aircraft release smoke in the colours of the Russian state flag above Red Square during an air parade on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in central Moscow, Russia May 9, 2020. REUTERS/Maxim Shemetov 

Su-25 jet aircraft release smoke in the colours of the Russian state flag above St. Basil's Cathedral during an air parade on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in central Moscow, Russia May 9, 2020. REUTERS/Maxim Shemetov 

Su-25 jet aircraft release smoke in the colours of the Russian state flag above St. Basil's Cathedral during an air parade on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in central Moscow, Russia May 9, 2020. REUTERS/Maxim Shemetov 

U.S. President Donald Trump and first lady Melania Trump are seen through smoke during a Victory in Europe Day 75th anniversary ceremony at the World War II Memorial in Washington, U.S., May 8, 2020. REUTERS/Tom Brenner 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the flypast, which marks the 75th anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia May 4, 2020. The traditional large-scale Victory Day military parade across Red Square was postponed due to the outbreak of the coronavirus disease (COVID 19). REUTERS/Carsten Seibold 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag above St.Basil's Cathedral during a rehearsal for the flypast, which marks the 75th anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia May 4, 2020. The traditional large-scale Victory Day military parade across Red Square was postponed due to the outbreak of the coronavirus disease (COVID 19). REUTERS/Shamil Zhumatov 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the flypast, which marks the 75th anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia May 4, 2020. The traditional large-scale Victory Day military parade across Red Square was postponed due to the outbreak of the coronavirus disease (COVID 19). REUTERS/Maxim Shemetov 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the flypast, which marks the 75th anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia May 4, 2020. The traditional large-scale Victory Day military parade across Red Square was postponed due to the outbreak of the coronavirus disease (COVID 19). REUTERS/Evgenia Novozhenina 

Russian Sukhoi Su-25 Frogfoot ground-attack planes release smoke in the colours of the Russian flag during a rehearsal for the flypast, which marks the 75th anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia May 4, 2020. The traditional large-scale Victory Day military parade across Red Square was postponed due to the outbreak of the coronavirus disease (COVID 19). REUTERS/Evgenia Novozhenina 

Birds fly as smoke billows from a burning garbage dump on Earth Day, as the spread of the coronavirus disease (COVID-19) continues, on the outskirts of Ahmedabad, India, April 22, 2020. REUTERS/Amit Dave 

Smoke rises from a forest fire in the exclusion zone around the Chernobyl nuclear power plant, outside the village of Rahivka, Ukraine April 5, 2020. Picture taken April 5, 2020. REUTERS/Yaroslav Yemelianenko 

Dust rises from the site of a Saudi-led air strike in Sanaa, Yemen March 30, 2020. REUTERS/Khaled Abdullah 

Dust rises from the site of a Saudi-led air strike in Sanaa, Yemen March 30, 2020. REUTERS/Khaled Abdullah 

Smoke billows from the site of a Saudi-led air strike in Sanaa, Yemen March 30, 2020. REUTERS/Khaled Abdullah 

Vapour trails are seen as a plane flies in an unusually quiet sky, as the number of coronavirus disease (COVID-19) cases grow around the world, over London, Britain March 21, 2020. REUTERS/Dylan Martinez 

A homeless person smokes a cigarette as he lies on a pavement in Rome, Italy, March 17, 2020. Since the coronavirus crisis, Red Cross workers have been increasing their daily activities to meet the growing needs of the homeless in Rome. With nobody around on the streets to give them food or money, and restaurants that would usually donate leftovers closed, homeless are struggling to find food and other supplies to keep them going. REUTERS/Guglielmo Mangiapane 

Smoke rises as a fire burns containers used to house refugees and migrants in the Moria camp on the island of Lesbos, Greece, March 16, 2020. REUTERS/Elias Marcou 

Smoke rises from the scene of a pipeline fire outbreak at a residential area of Abule Ado in Festac town, Lagos, Nigeria March 15, 2020. REUTERS/Seun Sanni 

A view from an airplane window shows smoke rising from chimneys in Helwan's industrial zone in Cairo, Egypt March 10, 2020. REUTERS/Mohamed Abd El Ghany 

A view from an airplane window shows smoke rising from chimneys in Helwan's industrial zone in Cairo, Egypt March 10, 2020. REUTERS/Mohamed Abd El Ghany 

Smoke and fire are seen near Turkey's Pazarkule border crossing, in Kastanies, Greece March 7, 2020. REUTERS/Florion Goga 

Smoke and fire are seen near Turkey's Pazarkule border crossing, in Kastanies, Greece March 7, 2020. REUTERS/Florion Goga 

Smoke and fire are seen near Turkey's Pazarkule border crossing, in Kastanies, Greece March 7, 2020. REUTERS/Florion Goga 

A demonstrator throws a Molotov cocktail at a police vehicle during a protest against Chile's government in Santiago, Chile March 6, 2020. REUTERS/Pablo Sanhueza 

A demonstrator throws a rock at a police vehicle which has been set ablaze during a protest against Chile's government in Santiago, Chile March 6, 2020. REUTERS/Ivan Alvarado 

A demonstrator reacts near a police vehicle which has been set ablaze amidst clashes with police during a protest against Chile's government in Santiago, Chile March 6, 2020. REUTERS/Ivan Alvarado 

A demonstrator ducks for cover amidst clashes with police during a protest against Chile's government in Santiago, Chile March 6, 2020. REUTERS/Ivan Alvarado 

Eva Chura and another woman, who are both 'pallaqueras' known as gold pickers, smoke and drink anise while chewing coca leaves, as part of a ritual for searching for gold performed before a shift, in La Rinconada, the Andes, Peru, October 11, 2019. "Sometimes there's gold, other times no. At the moment it's very low," she said. REUTERS/Nacho Doce SEARCH "WOMEN GOLD PICKERS FEMICIDE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Greek riot police officers walk amid clouds of tear gas near Turkey's Pazarkule border crossing, in Kastanies, Greece March 6, 2020. REUTERS/Florion Goga 

A Greek riot police officer stands guard as tear gas is being fired near Turkey's Pazarkule border crossing, in Kastanies, Greece March 6, 2020. REUTERS/Florion Goga 

A Palestinian flag is seen as smoke rises from burning tires during a protest against Jewish settlements in the village of Qusra, in the Israeli occupied West Bank, March 2, 2020. Picture taken March 2, 2020. REUTERS/Mohamad Torokman 

Smoke rises after an air strike in Saraqeb in Idlib province, Syria February 28, 2020. REUTERS/Umit Bektas 

Smoke rises after an air strike in Saraqeb in Idlib province, Syria February 28, 2020. REUTERS/Umit Bektas 

A demonstrator, who opposes the building of a new closed migrant detention centre, kicks a tear gas canister during clashes with riot police outside a military camp housing police officers, near the village of Pagani on the island of Lesbos, Greece, February 26, 2020. REUTERS/Elias Marcou 

Flame and smoke are seen during an Israeli air strike in the central Gaza Strip February 24, 2020. REUTERS/Ibraheem Abu Mustafa 

Trails of smoke are seen as rockets are fired towards Israel, in Gaza February 24, 2020. REUTERS/Mohammed Salem 

Flame and smoke are seen during Israeli air strikes in the southern Gaza Strip February 23, 2020. REUTERS/Ibraheem Abu Mustafa TPX IMAGES OF THE DAY 

Flame and smoke are seen during Israeli air strikes in the southern Gaza Strip February 23, 2020. REUTERS/Ibraheem Abu Mustafa 

Flame and smoke are seen during an Israeli air strike in the southern Gaza Strip February 23, 2020. REUTERS/Ibraheem Abu Mustafa 

Flame and smoke are seen during an Israeli air strike in the southern Gaza Strip February 23, 2020. REUTERS/Ibraheem Abu Mustafa 

A trail of smoke is seen after a rocket was fired from Gaza towards Israel, in Gaza February 23, 2020. REUTERS/Mohammed Salem 

A Spanish civil guard carries part of cigarettes in an illegal underground tobacco factory during a police raid in Monda, near Malaga, in southern Spain, February 20, 2020. Picture taken February 20, 2020. REUTERS/Jon Nazca 

A Hindu holy man, or sadhu, receives marijuana at the premises of Pashupatinath Temple during the Shivaratri festival in Kathmandu, Nepal February 21, 2020. REUTERS/Monika Deupala 

Ukrainian firefighters clear the way as demonstrators block a road during a protest against the arrival of a plane carrying evacuees from coronavirus-hit China's Hubei province in the village of Novi Sanzhary in Poltava region, Ukraine February 20, 2020. Local residents blocked the road leading to a sanatorium where the evacuees are due to be held in quarantine for at least two weeks. REUTERS/Valentyn Ogirenko 

A medic smokes near ambulances during the arrival of Ukrainians and other nationals, who were evacuated from China hit by an outbreak of the novel coronavirus, at an airport in Kharkiv, Ukraine February 20, 2020. REUTERS/Gleb Garanich 

A smoke rises from a port of Tripoli after being attacked in Tripoli, Libya February 18, 2020. REUTERS/Ahmed Elumami 

A Catholic church is pictured as a fire burns a tract of Amazon jungle being cleared by loggers and farmers near Porto Velho, Brazil August 27, 2019. Picture taken August 27, 2019. REUTERS/Ricardo Moraes 

A Catholic church is pictured as a fire burns a tract of Amazon jungle being cleared by loggers and farmers near Porto Velho, Brazil August 27, 2019. Picture taken August 27, 2019. REUTERS/Ricardo Moraes 

A Catholic church is pictured as a fire burns a tract of Amazon jungle being cleared by loggers and farmers near Porto Velho, Brazil August 27, 2019. Picture taken August 27, 2019. REUTERS/Ricardo Moraes 

Charred trees left in the wake of a recent bushfire are seen near Bumbalong, New South Wales, Australia, February 2, 2020. REUTERS/Loren Elliott 

A charred landscape left in the wake of a recent bushfire is seen near Bumbalong, New South Wales, Australia, February 2, 2020. REUTERS/Loren Elliott