A host works at London Eye in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in London, Britain, May 14, 2021. REUTERS/Peter Cziborra

A host cleans a pod of London Eye in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in London, Britain, May 14, 2021. REUTERS/Peter Cziborra

Hosts clean a pod of London Eye in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in London, Britain, May 14, 2021. REUTERS/Peter Cziborra

COP26 President Alok Sharma speaks with ScottishPower Renewables Chief Executive Lindsay McQuade, during an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool

Staff members work at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

Staff members work at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

Soccer Football - FC Barcelona president Joan Laporta speaks at Barca Cafe inauguration - Camp Nou, Barcelona, Spain - May 14, 2021 FC Barcelona president Joan Laporta wearing a mask at the Barca Cafe inauguration REUTERS/Albert Gea

Staff members work at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

COP26 President Alok Sharma gestures next to Emma Khadeh and her winning art competition piece, during an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool

A staff member works at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

A view of the Parthenon temple atop the Acropolis hill as a passenger ferry sails in the background, a day before the official opening of the tourist season, in Athens, Greece, May 14, 2021. REUTERS/Vassilis Triandafyllou

A staff member works at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

A staff member works at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

Staff members work at Royal & Derngate theatre in preparation to reopen as coronavirus disease (COVID-19) restrictions continue to ease, in Northampton, Britain, May 14, 2021. REUTERS/Andrew Boyers

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Czech Republic's Lea Kucerova in action during the Trap Women qualification REUTERS/Massimo Pinca

COP26 President Alok Sharma gestures next to Emma Khadeh, winner of an art competition, during an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Spain's Rafael Nadal in action during his quarter final match against Germany's Alexander Zverev REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Germany's Alexander Zverev in action during his quarter final match against Spain's Rafael Nadal REUTERS/Guglielmo Mangiapane

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Italy's Jessica Rossi in action during the Trap Women qualification REUTERS/Massimo Pinca

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Spain's Rafael Nadal in action during his quarter final match against Germany's Alexander Zverev REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Spain's Rafael Nadal in action during his quarter final match against Germany's Alexander Zverev REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Germany's Alexander Zverev in action during his quarter final match against Spain's Rafael Nadal REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Spain's Rafael Nadal in action during his quarter final match against Germany's Alexander Zverev REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Germany's Alexander Zverev in action during his quarter final match against Spain's Rafael Nadal REUTERS/Guglielmo Mangiapane

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 A fan wearing a Rafael Nadal t-shirt is pictured ahead of his quarter final match against Germany's Alexander Zverev REUTERS/Guglielmo Mangiapane

Residents queue at a sports hall to get vaccinated against the coronavirus disease (COVID-19) in Berlin, Germany, May 14, 2021. REUTERS/Axel Schmidt

Residents queue at a sports hall to get vaccinated against the coronavirus disease (COVID-19) in Berlin, Germany, May 14, 2021. REUTERS/Axel Schmidt

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Poland's Sandra Bernal in action during the Trap Women qualification REUTERS/Massimo Pinca

Residents queue at a sports hall to get vaccinated against the coronavirus disease (COVID-19) in Berlin, Germany, May 14, 2021. REUTERS/Axel Schmidt

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Italy's Gaia Ragazzini in action during the Trap Women qualification REUTERS/Massimo Pinca

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Croatia's Petra Martic celebrates after winning her quarter final match against Jessica Pegula of the U.S. REUTERS/Guglielmo Mangiapane

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Croatia's Petra Martic celebrates after winning her quarter final match against Jessica Pegula of the U.S. REUTERS/Guglielmo Mangiapane

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Croatia's Petra Martic celebrates after winning her quarter final match against Jessica Pegula of the U.S. REUTERS/Guglielmo Mangiapane

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Ashley Carroll of the U.S. in action during the Trap Women qualification REUTERS/Massimo Pinca

COP26 President Alok Sharma walks with ScottishPower Chief Executives Keith Anderson and Lindsay McQuade of Renewables, during an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Great Britain's Charlotte Lucy Hall in action during the Trap Women qualification REUTERS/Massimo Pinca

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 General view as a gun is reloaded REUTERS/Massimo Pinca

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Croatia's Petra Martic in action during her quarter final match against Jessica Pegula of the U.S. REUTERS/Guglielmo Mangiapane

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Croatia's Petra Martic in action during her quarter final match against Jessica Pegula of the U.S. REUTERS/Guglielmo Mangiapane

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Jessica Pegula of the U.S. during her quarter final match against Croatia's Petra Martic REUTERS/Guglielmo Mangiapane

COP26 President Alok Sharma speaks with ScottishPower Chief Executive Keith Anderson during an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool

A visitor looks at exhibits at the Parthenon Hall of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

A woman visits the Parthenon Hall of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

People walk on the premises of the Acropolis Museum with the Parthenon temple seen in the background, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

People visit the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

A visitor looks at exhibits at the Parthenon Hall of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

A man visits the Parthenon Hall of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

Visitors look at a replica of the ancient Parthenon temple at the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

Visitors look at exhibits of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

A visitor looks at exhibits of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

People visit the premises of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

A man takes a swab sample for the coronavirus disease (COVID-19) from his son at a surge testing site in London, Britain, May 14, 2021. REUTERS/Hannah McKay

People visit the premises of the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

People visit the Acropolis Museum, as museums open following the easing of measures against the spread of the coronavirus disease (COVID-19), a day before the official opening of the tourism season, in Athens, Greece, May 14, 2021. REUTERS/Alkis Konstantinidis

Pope Francis arrives for a conference on the Demographic Crisis in Rome, Italy May 14, 2021. Andrew Medichini/Pool via REUTERS

Tennis - WTA Premier 5 - Italian Open - Foro Italico, Rome, Italy - May 14, 2021 Jessica Pegula of the U.S. in action during her quarter final match against Croatia's Petra Martic REUTERS/Guglielmo Mangiapane

A man takes part in surge testing for the coronavirus disease (COVID-19) in London, Britain, May 14, 2021. REUTERS/Hannah McKay

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Croatia's Anton Glasnovic in action during the Trap Men qualification REUTERS/Massimo Pinca

Shooting - ISSF World Cup Shotgun - Lonato, Italy - May 14, 2021 Italy's Lorenzo Ferrari in action during the Trap Men qualification REUTERS/Massimo Pinca

COP26 President Alok Sharma attends an event at Whitelee Windfarm, marking six months until the U.N. Climate Change Conference, just outside Glasgow, Scotland, Britain, May 14, 2021. REUTERS/Russell Cheyne/Pool