World Environment Day, marked on June 5 every year, is meant for spreading awareness about ecological threats faced by our surroundings. These can include deforestation, global warming, excess carbon emissions and pollution. World Environment Day is marked on a rotational basis. Each year, one country hosts the day and organises events to raise awareness. Last year, Pakistan was assigned the theme Ecosystem Restoration. In 2022, the world will celebrate the 50th World Environment Day, bringing traditions a full circle. Also Read:Ways to have environment friendly and sustainable parties World Environment Day 2022 This year's World Environment Day celebrations will be marked in Stockholm, Sweden. The city was also the host of the first-ever World Environment Day in1972. The theme has also been replicated from 50 years ago. Only One Earth is this year's theme, which signifies that all planetary life has one shot at creating a sustainable environment for themselves. History and origin The need for marking the World Environment Day was realised at the onset of climate change. Extreme weather conditions and rising global temperatures were noticed in the industrialisation era. United Nations Conference on Human Environment was held in Stockholm in1972. Diplomats from various countries agreed to mark June 5 as World Environment Day. The host countries have historically organised awareness programs on June 5, with the participation of civil society, governments, schools, businesses and celebrities to urge the adoption of such corrective measures. Also Read:World Environment Day: 5 eye-opening facts about pollution What is the current environmental situation? TheNational Oceanic and Atmospheric Administration of the United States released a report on Friday that said the carbon dioxide concentrations in the atmosphere in Maywere 50% higher than during the pre-industrial era. The carbon dioxide levels seen on Earth in May 2022 have not been seen for about four million years, the environmental agency reported.