A balanced sculpture built during the European Stone Stacking Championships 2019 is seen in Dunbar, Scotland, on April 21, 2019. (Photo by AFP)

Boats are seen anchored on the calm waters of Avalon harbor in Catalina Island, about one hour away from the Los Angeles coast, the US, on April 20, 2019. (Photo by AFP)

In this picture, taken on April 23, 2019, a man is seen fishing on a platform at a beach in Lhokseudu near Banda Aceh, Indonesia. (By AFP)

A motorcyclist passes a cherry blossoms tree in Hamburg, Germany, on April 22, 2019. (Photo by AFP)

A worker throws a cloth during a drying process at Sukoharjo near Solo, Central Java Province, Indonesia, on April 23, 2019 in this photo taken by Antara Foto. (Via Reuters)  

A butterfly sits on dry earth at Los Laureles reservoir during Earth Day in Tegucigalpa, Honduras, on April 22, 2019. (Photo by AFP)

Graffiti left by climate change activists is seen as traffic and pedestrians move freely over Waterloo Bridge in London, Britain, on April 22, 2019, after police cleared a protest camp after seven days of blockade by the Extinction Rebellion group. (Photo by AFP)

People walk near St. Anthony�s Shrine in Colombo, three days after a string of bomb attacks on churches and luxury hotels across the island on Easter Sunday, in Sri Lanka, on April 24, 2019. (Photo by Reuters)

Members of the Mayo-Yoreme ethnic group celebrate Holy Week in their typical costumes dancing in San Miguel Zapotitlan, Sinaloa State, Mexico, on April 19, 2019. (Photo by AFP)

People visit the poppy fields at the Antelope Valley Poppy Reserve in Lancaster, California, the US, on April 21, 2019. (Photo by AFP)