Patrick Achi, secretary general of the Ivorian presidency, receives a vaccination against coronavirus disease (COVID-19) during a prevention campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

GL Issouf Kouyate Ivory Coast Police General Director, receives a vaccination against coronavirus disease (COVID-19) during a prevention campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

A health worker displays a vial of AstraZeneca/Oxford vaccine, during the vaccination campaign against COVID-19 in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Health workers stand at a vaccination center, during the campaign against coronavirus disease (COVID-19) in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Doctor Amani Simplice, a health worker, receives a vaccination against the coronavirus disease (COVID-19) during a vaccination campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

A health worker prepares to adminster a vaccination against the coronavirus disease (COVID-19) during a vaccination campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Raymonde Goudou Coffie, Ivory Coast's culture minister, receives a vaccination against the coronavirus disease (COVID-19) during a vaccination campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Patrick Achi, secretary general of the Ivorian presidency, receives a vaccination against the coronavirus disease (COVID-19) during a vaccination campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Officials look at the boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Workers offload boxes of AstraZeneca/Oxford vaccines as the country receives its first batch of coronavirus disease (COVID-19) vaccines under COVAX scheme, in Abidjan, Ivory Coast February 26, 2021. REUTERS/Luc Gnago

Dozens of container ships sit off the coast of Long Beach waiting to unload their cargo at the Port of Los Angeles in California, U.S., February 25, 2021. REUTERS/Mike

Dozens of container ships sit off the coast of Long Beach waiting to unload their cargo at the Port of Los Angeles in California, U.S., February 25, 2021. REUTERS/Mike

Dozens of container ships sit off the coast of Long Beach waiting to unload their cargo at the Port of Los Angeles in California, U.S., February 25, 2021. REUTERS/Mike

The cruise ship the Norwegian Jewel sits near dozens of container ships off the coast of Long Beach, California, U.S., February 25, 2021. REUTERS/Mike Blake

Children wait to take an electric autonomous bus which is driven in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company technicians and passengers are seen in the mirror of an electric autonomous bus which is driven in the autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Passengers sit in an electric autonomous bus which is driven in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Passengers sit in an electric autonomous bus which is driven in autopilot mode past the Pompidou museum, during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

People wait to take an electric autonomous bus which is driven in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

People wait to take an electric autonomous bus which is driven in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Children wait to take an electric autonomous bus which is driven in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Avanza bus company driver Cristobal Maldonado, 60, oversees an electric autonomous bus in autopilot mode during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

An electric autonomous bus travels in autopilot mode along a street during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

An electric autonomous bus travels in autopilot mode along a street during a month test phase with passengers in Malaga, Spain February 24, 2021. REUTERS/Jon Nazca

Rescued grey seal cubs wait for fish during their quarantine at LPA animal refuge in Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken on February 4, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken on February 4, 2021. REUTERS/Pascal Rossignol

A grey seal rests on a sandbank close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

An injured grey seal swims close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

Grey seals swim in the North Sea close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

A grey seal cub warms up under an infrared lamp during his quarantine at LPA animal refuge in Calais, France, February 9, 2021. Picture taken on February 9, 2021. REUTERS/Pascal Rossignol

A rescued grey seal cub eats fish during his quarantine at LPA animal refuge in Calais, France, February 9, 2021. Picture taken on February 9, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken on February 4, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

Dozens of grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken with a drone on February 4, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

A grey seal moves on sand to enter the North Sea close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

Dozens of grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken with a drone on February 4, 2021. REUTERS/Pascal Rossignol

Dozens of grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken with a drone on February 4, 2021. REUTERS/Pascal Rossignol

Grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken on February 4, 2021. REUTERS/Pascal Rossignol

Grey seals swim in the North Sea close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol

A grey seal rests on a sandbank close to Walde lighthouse in Marck near Calais, France, February 13, 2021. Picture taken on February 13, 2021. REUTERS/Pascal Rossignol TPX IMAGES OF THE DAY

Dozens of grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken with a drone on February 4, 2021. REUTERS/Pascal Rossignol TPX IMAGES OF THE DAY

Dozens of grey seals rest on a sandbank close to Walde lighthouse in Marck near Calais, France, February 4, 2021. Picture taken with a drone on February 4, 2021. REUTERS/Pascal Rossignol

The North Pembrokeshire coast is seen ahead of the 25th anniversary of the grounding of supertanker Sea Empress, which caused one of Britain's worst environmental disasters, at Milford Haven, Wales, Britain February 14, 2021. REUTERS/Rebecca Naden

The North Pembrokeshire coast is seen ahead of the 25th anniversary of the grounding of supertanker Sea Empress, which caused one of Britain's worst environmental disasters, at Milford Haven, Wales, Britain February 14, 2021. REUTERS/Rebecca Naden