Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, outside Parliament in Madrid, March 30, 2022. REUTERS/Susana Vera 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, outside Parliament in Madrid, March 30, 2022. REUTERS/Susana Vera 

People hold flags as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Madrid, March 26, 2022. REUTERS/Javier Barbancho 

People hold flags and placards as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Madrid, March 26, 2022. REUTERS/Javier Barbancho 

People hold flags as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Madrid, March 26, 2022. REUTERS/Javier Barbancho 

People hold flags as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Madrid, March 26, 2022. REUTERS/Javier Barbancho 

A woman holds a flag of Western Sahara as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Madrid, March 26, 2022. REUTERS/Javier Barbancho 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

People cast shadows as members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas de Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Las Palmas De Gran Canaria, Spain, March 26, 2022. REUTERS/Borja Suarez - REFILE - CORRECTING CITY 

Waitresses clean the tables and chairs at a bar terrace as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 25, 2022. REUTERS/Jon Nazca 

A worker cleans the bar terrace as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 25, 2022. REUTERS/Jon Nazca 

Waitstaff clean the awning of a bar as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 25, 2022. REUTERS/Jon Nazca 

Waitstaff use brooms to clean the bar terraces as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 25, 2022. REUTERS/Jon Nazca 

Tourists listen to a guide as a storm blows sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

Dust covers the facade of a house as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

A worker cleans the showcase of a clothing store as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

Dust covers the facade of a bullring as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

Waitresses clean the tables and chairs at a bar terrace as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

Waitresses clean the tables and chairs at a bar terrace as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

Sand-covered chairs and tables are seen at a restaurant terrace as a storm blew sand from the Sahara desert over Andalusia, in Ronda, Spain, March 24, 2022. REUTERS/Jon Nazca 

A woman takes pictures with her mobile phone of members of Spain's Sahrawi community and their supporters taking part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on Sahrawi flag reads, "Sahara Freedom." REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on Sahrawi flag reads, "Sahara Freedom." REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on Sahrawi flag reads, "Sahara Freedom." REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on Sahrawi flags read, "Sahara Freedom". REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on the Sahrawi flags read, "Sahara Freedom". REUTERS/Jon Nazca 

A woman shows the victory sign as she takes part in a protest with members of Spain's Sahrawi community and their supporters against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. REUTERS/Jon Nazca 

Members of Spain's Sahrawi community and their supporters take part in a protest against Spain's new position on the fate of Western Sahara as an autonomous region of Morocco, in Malaga, March 22, 2022. Words on Sahrawi flags read, "Sahara Freedom". REUTERS/Jon Nazca 

The sun turns red during sunrise due to the Sahara sand near Dresden, Germany, March 17, 2022. REUTERS/Matthias Rietschel 

The sun turns red during sunrise due to the Sahara sand near Dresden, Germany, March 17, 2022. REUTERS/Matthias Rietschel 

The sun turns red during sunrise due to the Sahara sand near Dresden, Germany, March 17, 2022. REUTERS/Matthias Rietschel 

Dust particles blown from the Sahara to Europe are seen on the bonnet of a Mercedes-Benz car after a rainfall in Zurich, Switzerland March 16, 2022. REUTERS/ArndWiegmann 

Dust particles blown from the Sahara to Europe are seen on the bonnet of a Porsche car after a rainfall in Zurich, Switzerland March 16, 2022. REUTERS/ArndWiegmann 

Dust particles blown from the Sahara to Europe are seen on the bonnet of a Maserati car after a rainfall in Zurich, Switzerland March 16, 2022. REUTERS/ArndWiegmann 

Dust mixed with water drops cover a car as storm Celia blew sand from the Sahara desert over Madrid, March 15, 2022. REUTERS/Susana Vera 

Two men stand stand on a hill, as storm Celia blew sand from the Sahara desert over Madrid, March 15, 2022. REUTERS/Susana Vera 

A man and a dog stand on a hill, as storm Celia blew sand from the Sahara desert over Madrid, March 15, 2022. REUTERS/Susana Vera 

Dust from the Sahara makes the sky misty behind a former Swiss Air Force Mirage 2000 fighter jet placed at the entrance of a Swiss airbase in Payerne, Switzerland March 15, 2022. REUTERS/Arnd Wiegmann 

Tourists take pictures of Puerta del Sol square as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

Tourists visit Puerta del Sol square as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

A person wearing a protective mask crosses a bridge as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT TPX IMAGES OF THE DAY 

Cars are covered in dust as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

A man walks his dog near Almudena Cathedral, as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

Dust covers chairs and a table at a restaurant terrace as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera 

A man takes a picture near the Royal Palace, as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

A man cleans the sidewalk, as storm Celia blew sand from the Sahara desert over Madrid, Spain, March 15, 2022. REUTERS/Susana Vera REFILE - QUALITY REPEAT 

Staffan de Mistura, U.N. envoy to Western Sahara, meets with people as he visits a school in Tindouf, Algeria, January 16, 2022. Picture taken January 16, 2022. REUTERS/Ramzi Boudina 

Staffan de Mistura, U.N. envoy to Western Sahara, greets Sahrawi soldiers upon his arrival to visit a military museum in Tindouf, Algeria, January 16, 2022. Picture taken January 16, 2022. REUTERS/Ramzi Boudina 

Staffan de Mistura, U.N. envoy to Western Sahara, meets with Red Cross representatives in Tindouf, Algeria, January 16, 2022. Picture taken January 16, 2022. REUTERS/Ramzi Boudina 

Staffan de Mistura, U.N. envoy to Western Sahara, visits a military museum in Tindouf, Algeria, January 16, 2022. Picture taken January 16, 2022. REUTERS/Ramzi Boudina 

Brahim Ghali, President of the Sahrawi Arab Democratic Republic (SADR) and Secretary General of the Polisario Front meets U.N. Western Sahara envoy Staffan de Mistura in Tindouf, Algeria, January 16, 2022. REUTERS/Ramzi Boudina 

Brahim Ghali, President of the Sahrawi Arab Democratic Republic (SADR) and Secretary General of the Polisario Front meets U.N. Western Sahara envoy Staffan de Mistura in Tindouf, Algeria, January 16, 2022. REUTERS/Ramzi Boudina 

Brahim Ghali, President of the Sahrawi Arab Democratic Republic (SADR) and Secretary General of the Polisario Front meets U.N. Western Sahara envoy Staffan de Mistura in Tindouf, Algeria, January 16, 2022. REUTERS/Ramzi Boudina 

U.N. Western Sahara envoy Staffan de Mistura visits the Military Museum in refugee camp in Tindouf, Algeria, January 16, 2022. REUTERS/Ramzi Boudina