Secondary school graduates play in a fountain as they celebrate the last day of school, traditionally called the “last bell” in central Kiev, Ukraine on May 31, 2019. (Photo by Valentyn Ogirenko/Reuters)

Empty gloves are seen at the side of a tray of Maryland Blue Crabs at Maine Avenue Fish Market which is the United States oldest fish market in continual operation since 1805, in Washington, U.S., May 6, 2019. (Photo by Clodagh Kilcoyne/Reuters)

Drinking from a helmet at a graduation ceremony held by the Military University of the Russian Defence Ministry at Moscow's Victory Park in Moscow, Russia on June 15, 2019. (Photo by Gavriil Grigorov/TASS)

A woman instructs a boy on how to pose for pictures in front of a mural depicting Soviet pilot Valery Chkalov – who took a non-stop flight over the Arctic and landed in the US state of Washington in 1937 – at Chkalovskaya metro station in Moscow on August 14, 2019. (Photo by Yuri Kadobnov/AFP Photo)

Guests arrive at the red carpet for the movie “The Truth” (La Verite) presented in competition at the 76th Venice Film Festival, in Venice, Italy, August 28, 2019. (Photo by Yara Nardi/Reuters)

The Grevy’s Illusion by Yaron Schmid, USA: a Grevy’s zebra staring at the camera in Lewa, Kenya. Third place – wildlife. (Photo by Yaron Schmid/The Nature Conservancy Global Photo Contest 2019)

Tuvalu Beneath the Rising Tide by Sean Gallagher, Tuvalu. Changing environments prize: Fallen trees lie on a beach as the waves from the Funafuti lagoon in Tuvalu lap around them. Land erosion has always been a problem for the South Pacific country but problems are intensifying as sea levels rise. Rising seas are on the verge of completely submerging the tiny archipelago’s islands. (Photo by Sean Gallagher/CIWEM Environmental Photographer of the Year 2019)

Canada's New Democratic Party (NDP) leader Jagmeet Singh meets with young adults outside Ryerson University during an election campaign stop in Toronto, Ontario, Canada on October 8, 2019. (Photo by Chris Helgren/Reuters)