Why in news? 

The World Environment Day was observed on 5^th June

What is World Environment Day?

• Led by the United Nations Environment Programme (UNEP) and held annually on 5 June since 1973, World Environment Day is the largest global platform for environmental public outreach and is celebrated by millions of people across the world. This year it is hosted by Sweden.
• Theme : only one earth

Where did #OnlyOneEarth come from?

• “Only One Earth” was the slogan for the first United Nations Conference on the Human Environment, held in Stockholm in 1972. This put sustainable development on the global agenda and led to the establishment of World Environment Day. Fifty years later, Sweden is hosting Stockholm+50 from 2 to 3 June, and World Environment Day on 5 June.