Brazil's Ministry of Health announced nationwide inoculation campaign against COVID-19, January 18, 2021. /CFP

Mount Etna volcano erupts in Catania, Italy, January 19, 2021. /CFP

The Washington National Cathedral and churches across the United States toll bells to mark the deaths of more than 400,000 Americans from COVID-19, January 19, 2021. /CFP

Joe Biden is sworn in as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, D.C., U.S., January 20, 2021. /CFP

Members of the local emergency services rescue trapped residents after heavy rains caused flooding in Northwich, England, January 21, 2021. /CFP

Residents of Nagasaki, Japan, release balloons after the Treaty on the Prohibition of Nuclear Weapon, world's first-ever treaty to ban nuclear weapons entered into force, January 22, 2021. /CFP