Chandigarh: Panjab University and SAPT India celebrated World Environment Day through plantation drives, cleanliness drives and others. Prof MC Sidhu of the PU said that the ban on polythene and minimum use of chemicals in day-to-day life could help save the environment. Anirudh Uniyal, National President, SAPT India, said environment conservation was the moral responsibility of every citizen of the nation. —TNS