Explanation:

World Environment Day is celebrated on June 5th each year to raise awareness about environmental issues and promote global action for environmental protection. Established by the United Nations in 1972, this day encourages individuals, communities, and governments to take positive environmental actions, such as reducing plastic pollution, conserving biodiversity, and combating climate change. World Environment Day focuses on a specific environmental theme each year and engages millions of people worldwide in activities such as tree-planting campaigns, clean-up drives, environmental education programs, and advocacy for sustainable lifestyles. It underscores the importance of environmental sustainability and collective efforts to preserve the planet's natural resources for present and future generations.