The correct answer is 05 June. The World Environment Day is observed every year on 5 June. It is celebrated across the world to raise an awareness and describe the importance of Mother Nature. World Environment Day was established in 1972 by the UN General Assembly at the time of Stockholm Conference. The World Environment Day theme for 2022 is "Only One Earth" and the event is being hosted by Sweden. Additional InformationList of Some important days in June 2022:? DaysEvents1st June World Milk DayGlobal Parents Day4th JuneInternational Day of Innocent Children Victims of Aggression 5th JuneWorld Environment Day7th June World Food Safety Day12th June World Day Against Child Labour14th June World Blood Donor Day17th June World Day to Combat Desertification and Drought20th June World Refugee Day21st June World Hydrography DayInternational Yoga DayWorld Music day