John Kerry, Special Presidential Envoy for Climate, delivers remarks during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

John Kerry, Special Presidential Envoy for Climate, delivers remarks during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

Soccer Football - Serie A - AS Roma v Atalanta - Stadio Olimpico, Rome, Italy - April 22, 2021 Atalanta's Josip Ilicic in action REUTERS/Alberto Lingria

John Kerry, Special Presidential Envoy for Climate, delivers remarks during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

John Kerry, Special Presidential Envoy for Climate, whispers in Press Secretary Jen Psaki?s ear during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

John Kerry, Special Presidential Envoy for Climate, delivers remarks during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

Katie Wright, the mother of Daunte Wright, a Black man who was fatally shot by a police officer after a routine traffic stop, reacts during his funeral at Shiloh Temple International Ministries in Minneapolis, Minnesota, U.S., April 22, 2021. REUTERS/Octavio Jones

John Kerry, Special Presidential Envoy for Climate, looks on during a press briefing at the White House in Washington, U.S., April 22, 2021. REUTERS/Tom Brenner

Doses of the Pfizer-BioNTech COVID-19 vaccine are seen at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

A doctor vaccinates a person with a dose of the Pfizer-BioNTech COVID-19 vaccine at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

Recipients wait for a dose of the Pfizer-BioNTech COVID-19 vaccine at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

A nurse performs a wellness check of a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

New York City Mayoral candidate Eric Adams stands outside a bodega where a woman was shot and killed in broad daylight on April 21 according to NYPD, in the Park Slope section of the Brooklyn borough of New York City, U.S., April 22, 2021. REUTERS/Shannon Stapleton

A nurse performs a wellness check of a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

A doctor vaccinates a person with a dose of the Pfizer-BioNTech COVID-19 vaccine at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

A doctor waits for a vaccine recipient at Austria Center, which has been set up as a coronavirus disease (COVID-19) mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

A makeshift memorial sits outside a bodega where a woman was shot and killed in broad daylight on April 21 according to NYPD, in the Park Slope section of the Brooklyn borough of New York City, U.S., April 22, 2021. REUTERS/Shannon Stapleton

Nurses check the charts of two coronavirus disease (COVID-19) patients inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken on April 15, 2021. REUTERS/Carlos Osorio

Empty Pfizer-BioNTech COVID-19 vaccine vials and syringes are seen in a disposal container at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

Soccer Football - Serie A - AS Roma v Atalanta - Stadio Olimpico, Rome, Italy - April 22, 2021 Atalanta coach Gian Piero Gasperini reacts REUTERS/Alberto Lingria

Empty Pfizer-BioNTech COVID-19 vaccine vials and syringes are seen in a disposal container at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

Soccer Football - Serie A - AS Roma v Atalanta - Stadio Olimpico, Rome, Italy - April 22, 2021 AS Roma's Edin Dzeko in action with Atalanta's Jose Luis Palomino REUTERS/Alberto Lingria

People walk towards the COVID-19 vaccine and test centre at Austria Center, which has been set up as a coronavirus disease mass vaccination centre, in Vienna, Austria April 22, 2021. REUTERS/Lisi Niesner

Nurses waiting outside the isolation room help the team working inside the isolation room of a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

People wave Albanian flags during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

People wave Albanian flags during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Leader of the Socialist Party Edi Rama delivers his speech during an election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

A woman waves the Albanian flag during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Nurses communicate through the glass door of an isolation room of a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

Relatives stand next to the burning funeral pyre of a person, who died due to the coronavirus disease (COVID-19), at a crematorium ground in New Delhi, India, April 22, 2021. REUTERS/Danish Siddiqui

A mass cremation of victims who died due to the coronavirus disease (COVID-19), is seen at a crematorium ground in New Delhi, India, April 22, 2021. Picture taken with a drone. REUTERS/Danish Siddiqui TPX IMAGES OF THE DAY

Soccer Football - La Liga Santander - Atletico Madrid v Huesca - Wanda Metropolitano, Madrid, Spain - April 22, 2021 Atletico Madrid's Marcos Llorente in action REUTERS/Sergio Perez

A mass cremation of victims who died due to the coronavirus disease (COVID-19), is seen at a crematorium ground in New Delhi, India, April 22, 2021. Picture taken with a drone. REUTERS/Danish Siddiqui

A mass cremation of victims who died due to the coronavirus disease (COVID-19), is seen at a crematorium ground in New Delhi, India, April 22, 2021. Picture taken with a drone. REUTERS/Danish Siddiqui

NYPD police tape hangs outside a bodega where a woman was shot and killed in broad daylight on April 21 according to NYPD, in the Park Slope section of the Brooklyn borough of New York City, U.S., April 22, 2021. REUTERS/Shannon Stapleton

Olivia Coughlin, a registered healthcare social worker, calls the family of a coronavirus disease (COVID-19) patient who died inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Germany's Angelique Kerber leaves the court after losing her round of 16 match against Ukraine's Elina Svitolina Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Germany's Angelique Kerber leaves the court after losing her round of 16 match against Ukraine's Elina Svitolina Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina celebrates winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina celebrates winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina celebrates winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina celebrates winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina celebrates winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

The team leader nurse gets updates from another nurse while they treat coronavirus disease (COVID-19) patients inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 20, 2021. Picture taken April 20, 2021. REUTERS/Carlos Osorio

From left: French Minister of National Education Jean-Michel Blanquer, French Health Minister Olivier Veran and French Prime Minister Jean Castex speak together after a news conference on the government strategy for the ongoing coronavirus disease (COVID-19) pandemic, Paris, France, April 22, 2021. Ludovic Marin/Pool via Reuters

Tennis - WTA 500 - Stuttgart Open - Porsche-Arena, Stuttgart, Germany - April 22, 2021 Ukraine's Elina Svitolina after winning her round of 16 match against Germany's Angelique Kerber Pool via REUTERS/Thomas Kienzle

A woman waves the Albanian flag during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Soccer Football - La Liga Santander - Atletico Madrid v Huesca - Wanda Metropolitano, Madrid, Spain - April 22, 2021 Atletico Madrid's Jose Gimenez in action with Huesca's Dimitris Siovas REUTERS/Sergio Perez

A respiratory therapist checks on the welfare of coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 20, 2021. Picture taken April 20, 2021. REUTERS/Carlos Osorio

People wave Albanian flags during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

People wave Albanian flags during a Socialist Party election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Soccer Football - La Liga Santander - Atletico Madrid v Huesca - Wanda Metropolitano, Madrid, Spain - April 22, 2021 Atletico Madrid coach Diego Simeone REUTERS/Sergio Perez

A nurse passes instruments to the team working inside the isolation room of a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 15, 2021. Picture taken April 15, 2021. REUTERS/Carlos Osorio

A respiratory therapist and nurses prepare a ventilator to treat a coronavirus disease (COVID-19) patient inside the intensive care unit of Humber River Hospital in Toronto, Ontario, Canada April 20, 2021. Picture taken April 20, 2021. REUTERS/Carlos Osorio

Leader of the Socialist Party Edi Rama delivers his speech during an election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Leader of the Socialist Party Edi Rama delivers his speech during an election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Leader of the Socialist Party Edi Rama delivers his speech during an election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

Soccer Football - La Liga Santander - Atletico Madrid v Huesca - Wanda Metropolitano, Madrid, Spain - April 22, 2021 Atletico Madrid's Yannick Carrasco in action with Huesca's Pedro Mosquera REUTERS/Sergio Perez

Leader of the Socialist Party Edi Rama delivers his speech during an election rally in Tirana, Albania April 22, 2021. REUTERS/Florion Goga

A pilot steers a scaled-down model of an ULCS container ship, named the Spirit of Port Revel, on a lake at the Port Revel Shiphandling Training Centre in Saint-Pierre-de-Bressieux, France, April 19, 2021. Picture taken April 19, 2021. REUTERS/Stephane Mahe

The Boeoegg, a snowman made of wadding and filled with firecrackers, burns in a bonfire on the landmark of Devil's Bridge in the Schoellenen Gorge near the Alpine resort of Andermatt, Switzerland April 19, 2021. Picture taken April 19, 2021. REUTERS/Arnd Wiegmann

Belgian artist Alain Verschueren wears his "Portable Oasis" while performing in a street, saying he wanted to be in his bubble in the middle of the city, amid the coronavirus disease (COVID-19) outbreak in Brussels, Belgium April 16, 2021. Picture taken April 16, 2021. REUTERS/Yves Herman