World Environment Day was first celebrated on June 5, 1974, and this is one of the biggest annual events of the United Nations.

The primary aim of the World Environment Day is to raise awareness among masses across the world on the environment, its degradation and also conservation.

The day was first established in 1972 by the United Nations General Assembly on the first day of the Stockholm Conference on the Human Environment.

Every year WED is celebrated keeping in mind a particular theme and the theme of the first  World Environment Day in Spokane in the USA was 'Only One Earth'.

Like the previous years, the theme for World Environment Day 2020 is 'Biodiversity'.

Announcing about it, the United Nations in a statement said, "This year, the theme is biodiversity- a concern that is both urgent and existential."

"Recent events, from bushfires in Brazil, the United States, and Australia to locust infestations across East Africa- and now, a global disease pandemic- demonstrate the interdependence of humans and the webs of life, in which they exist," the statement added.

This year's theme focuses on 'time for nature' and providing the essential infrastructure that supports life on Earth and human development.

This year's event will be hosted in Colombia and Germany will partner the event.

Here are a few famous quotes on the environment-

Thank God men cannot fly, and lay waste the sky as well as the earth- Henry David Thoreau

Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it’s the only thing that ever has- Margaret Mead

It is horrifying that we have to fight our own government to save the environment- Ansel Adams

Birds are indicators of the environment. If they are in trouble, we know we’ll soon be in trouble- Roger Tory Peterson

Conservation is a state of harmony between men and land- Aldo Leopold

What we are doing to the forests of the world is but a mirror reflection of what we are doing to ourselves and to one another- Mahatma Gandhi

The environment is everything that isn’t me- Albert Einstein