This compilation photo shows the lights of Namsan Seoul Tower (R) turned off for 10 minutes from 8 p.m., on April 22, 2020, to mark Earth Day.

Yonhap News CEO Cho Sung-boo (2nd from R) and Park Ki-tae (2nd from L), head of the nongovernmental organization Voluntary Agency Network of Korea, attend a ribbon-cutting ceremony at the National

A group of vegans rallies in Seoul on April 22, 2020, to call for the consumption of vegetable meals as part of events to mark the 50th anniversary of Earth Day that fell the same day.

Fragrant colorful flowers show off their beauty these days as spring has come to enliven the nature, Bojnourd, North Khorasan Province, northeastern Iran, April 22, 2020. IRNA/Vahid Khademi.

Members of an environment conservation organization hold a rally in Seoul on April 22, 2020, to raise public awareness of global warming. (Yonhap)
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This photo, provided by the South Korean Embassy in Gabon, shows Gabonese government officials (1st and 2nd from R) posing for a photo while welcoming the arrival of 50,000 coronavirus test kits fr

Visitors walk along a trail on Mount Biseul covered with blooming azaleas in the southeastern city of Daegu on April 21, 2020. (Yonhap)
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People enjoy kiteboarding at Hamdeok Beach in the city of Jeju on South Korea's largest island of Jeju on April 21, 2020. (Yonhap)
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A representative from the Indian embassy in Seoul signs a deal with South Korean point-of-care testing company Humasis to purchase COVID-19 testing kits, on April 20, 2020, in this photo provided b

This photo, provided by the Cultural Heritage Administration, shows traditional archery.