Zeeshan Rasool Khan

  By – Zeeshan Rasool Khan To create global awareness about the importance of a healthy environment, world environment day is celebrated every year on June 5. Also known as, Eco day or simply Environment day, world environment day was established by UN General Assembly in 1972. Its celebrations are theme-based and each year a particular theme is declared by United Nations. The theme of first-world environment day held in 1974 was ‘only one earth’ and this year it is ‘Ecosystem Restoration’. What is an Ecosystem? The term Ecosystem was introduced by A.G Tansley in 1935. He defined it as; the system resulting from the interaction of all living and non-living factors of the environment. In fact, in nature, the living organisms and their non-living environment interact with each other and they are so much inseparably interlinked that there is a frequent exchange of material and energy leading to a tropic structure, biotic diversity, and material cycle (i.e exchange of materials). T