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On June 5, 1973, the world first celebrated World Environment Day. The date was chosen by the United Nations to honor the 1972 UN Conference on the Human Environment, a landmark summit in conservation and environmental awareness.
 
The UN calls World Environment Day “the biggest day for positive environmental action.” It is a day for public outreach as well as personal responsibility—an “opportunity to care for the Earth and become agents of change.”
 
Every year, World Environment Day is hosted by a different city or region, with a different theme. Kigali, Rwanda, hosted the 2010 World Environment Day, with the theme “Many Species. One Planet. One Future.” In 2018, India hosted World Environment Day, with the theme "Beat Plastic Pollution."
celebrate
Verb

to observe or mark an important event with public and private ceremonies or festivities.

city
Noun

large settlement with a high population density.

Noun

management of a natural resource to prevent exploitation, destruction, or neglect.

environment
Noun

conditions that surround and influence an organism or community.

Noun

body of land surrounded by water.

landmark
Noun

significant or important event.

Noun

political unit made of people who share a common territory.

public
Noun

people of a community.

Noun

any area on Earth with one or more common characteristics. Regions are the basic units of geography.

Noun

base level for measuring elevations. Sea level is determined by measurements taken over a 19-year cycle.

summit
Noun

meeting or conference of top leaders.

United Nations
Noun

international organization that works for peace, security and cooperation.

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