France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as speaks with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren next to Mayor of Poissy Karl Olive in a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he stands next to Mayor of Poissy Karl Olive in a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he arrives to speak with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he arrives to speak with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he arrives to speak with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he arrives to speak with schoolchildren during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wearing a protective face mask with a blue-white-red coloured ribbon gestures while speaking with schoolchildren in a classroom during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS TPX IMAGES OF THE DAY

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he gestures while speaking with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

France's President Emmanuel Macron wears a protective face mask with a blue-white-red coloured ribbon as he speaks with schoolchildren during a class during a visit to the Pierre de Ronsard elementary school in Poissy, France, May 5, 2020, as France readies to face an ease in the coronavirus lockdown measures. Ian Langsdon/Pool via REUTERS

Demonstrators take cover from water cannon fired by riot police, with an improvised shield during a protest against Chile's government, in Santiago, Chile November 28, 2019. REUTERS/Ivan Alvarado

Riot police fire water cannon as demonstrators protest against Chile's government, in Santiago, Chile November 28, 2019. REUTERS/Ivan Alvarado

The U.S. Capitol building is seen in a reflection on Capitol Hill in Washington, U.S., November 27, 2019. REUTERS/Loren Elliott

Waves at high tide make their way over rocks and onto the road in Oceanside, California, U.S., November 27, 2019. REUTERS/Mike Blake

Sugar beets covered in snow at a processing facility in East Grand Forks, Minnesota, U.S., November 22, 2019. Due to a wet summer and early frost, sugar beet farmers were forced to leave hundreds of acres of sugar beet crop unharvested, a hard hit for the US agriculture industry already experiencing a difficult few years. Picture taken November 22, 2019. REUTERS/Nicholas Pfosi

Sugar beets covered in snow at a processing facility in East Grand Forks, Minnesota, U.S., November 22, 2019. Due to a wet summer and early frost, sugar beet farmers were forced to leave hundreds of acres of sugar beet crop unharvested, a hard hit for the US agriculture industry already experiencing a difficult few years. Picture taken November 22, 2019. REUTERS/Nicholas Pfosi

Sugar beets covered in snow at a processing facility in East Grand Forks, Minnesota, U.S., November 22, 2019. Due to a wet summer and early frost, sugar beet farmers were forced to leave hundreds of acres of sugar beet crop unharvested, a hard hit for the US agriculture industry already experiencing a difficult few years. Picture taken November 22, 2019. REUTERS/Nicholas Pfosi

Lightnings strike in the sea off the shore of Artemida, Greece, November 26, 2019. REUTERS/Vassilis Triandafyllou

A lightning strikes over the sea off the shore of Artemida, Greece, November 26, 2019. REUTERS/Vassilis Triandafyllou

Lightnings strike in the sea off the shore of Artemida, Greece, November 26, 2019. REUTERS/Vassilis Triandafyllou

Partly frozen Svisloch river is seen in Minsk, Belarus November 26, 2019. REUTERS/Vasily Fedosenko

A patch of snow is covered for tourists to use with slides later in the season on the Tsanfleuron Glacier near Les Diablerets in Switzerland, September 13, 2019. Picture taken September 13, 2019. REUTERS/Denis Balibouse

The Eiger, Guggi and Giesen Glaciers are pictured near the Jungfrau in the Swiss Alps in Wengen, Switzerland August 27, 2019. Picture taken August 27, 2019. REUTERS/Denis Balibouse

A Jungfraubahn train is pictured in front of the Eiger Glacier in Wengen, Switzerland August 27, 2019. Picture taken August 27, 2019. REUTERS/Denis Balibouse

Egrets are seen next to a discarded tire on the shores of the Paraguay River, in Ita Enramada, Paraguay November 23, 2019. REUTERS/Jorge Adorno

A view of the White House by night in Washington, U.S., November 16, 2019. REUTERS/Yara Nardi

Car is seen covered with snow in village of Iselsberg, Austria, November 14, 2019. REUTERS/Antonio Bronic

Cars move through snow covered fields, on a road leading in Oberwarngau, near Munich, Germany November 14, 2019. REUTERS/Andreas Gebert

Snow drifts are seen on a summit near the village of Seefeld, Austria, November 14, 2019 REUTERS/Angelika Warmuth

Larches stand in the snow near the village of Seefeld, Austria, November 14, 2019 REUTERS/Angelika Warmuth

Larches stand in the snow near the village of Seefeld, Austria, November 14, 2019 REUTERS/Angelika Warmuth

Snow lies on a deck chair in a garden near the village of Seefeld, Austria, November 14, 2019 REUTERS/Angelika Warmuth

The road along the Russian - Norway border is seen in Pasvik valley, Finnmark county, Norway, October 23, 2019. REUTERS/Maxim Shemetov

A general view of houses in Kirkenes, Norway, October 24, 2019. REUTERS/Maxim Shemetov

A road sign lies on the grass in Kirkenes, Norway, October 26, 2019. REUTERS/Maxim Shemetov

A lightning strikes in the sea off the shore of Artemida, Greece, November 13, 2019. REUTERS/Vassilis Triandafyllou

A seagull flies over a lake on a sunny autumn day in Tervuren, near Brussels, Belgium November 12, 2019. REUTERS/Francois Lenoir

A fisherman is seen during a rainy day at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil November 11, 2019. REUTERS/Sergio Moraes

A fisherman is seen during a rainy day at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil November 11, 2019. REUTERS/Sergio Moraes

People ride on horses in front of the snow-covered mountains in the central Swiss Alps near Studen, Switzerland November 9, 2019. REUTERS/Arnd Wiegmann

Snow covered farm fields make a quit-like patchwork near Bridgewater, South Dakota, U.S. November 8, 2019. REUTERS/Jim Urquhart

Hijabs for sale are pictured at a stall of Tanah Abang textile market in Jakarta, Indonesia, November 5, 2019. REUTERS/Willy Kurniawan TPX IMAGES OF THE DAY

The Palace of Westminster and a man walking are reflected in a puddle in London, Britain November 4, 2019. REUTERS/Yara Nardi TPX IMAGES OF THE DAY

A wall with inscription of Hindu religious book Ramayana, is seen inside a temple in Ayodhya, India, October 22, 2019. Picture taken October 22, 2019. REUTERS/Danish Siddiqui

A crow sits on a barricade in front of India Gate amidst smog in New Delhi, November 3, 2019. REUTERS/Adnan Abidi

Waves crash against a lighthouse during a windy day in Boulogne-sur-Mer, France, 2 November, 2019. REUTERS/Pascal Rossignol

Waves crash against a lighthouse during a windy day in Boulogne-sur-Mer, France, 2 November, 2019. REUTERS/Pascal Rossignol

Waves crash against a lighthouse during a windy day in Boulogne-sur-Mer, France, 2 November, 2019. REUTERS/Pascal Rossignol