The Institute of Advanced Study in Science and Technology (IASST), Guwahati (an autonomous institute under the Department of Science and Technology, Government of India), has celebrated the World Environment Day on 5th June, 2021 under the 75th Year of India’s Independence banner: Azadi Ke Amrit Mahotsava.The online celebrations commenced with a welcome address by Dr. Arundhuti Devi, Associate Professor along with an introduction to the present status of the Deepor Beel ecosystem. Prof. Ashis K. Mukherjee, Director, IASST delivered the inaugural address by highlighting the ongoing research activities at the Institute in multifarious areas of ecology and environment. Prof. Mukherjee has also emphasised on conversion of waste to value added product with appropriate processing. Eminent academicians as well as scientists from different renowned institutions of India have participated and presented valuable talks pertaining to World Environment Day, 2021. Prof. Krishna Gopal Bhattacharyya, presently Professor of Chemistry, Assam Don Bosco University delivered a speech on this year’s theme of the World Environment Day, “Ecosystem Restoration” as given by the UN Environment Programme. He lauded the move by the UN in taking up 2021-2030 as the UN Decade for Ecosystem Restoration to reclaim some of the lost forests and wetlands, and also to mitigate some of the effects of Climate Change. Professor Ramkrishna Sen, Professor of Biotechnology, Indian Institute of Technology, Kharagpur spoke on UN-SDG-inspired Algae-driven Journey through the Contemporary R&D Challenges of Environment, Energy and Water. Prof. Banwari Lal, Senior Director, Environmental and Industrial Biotechnology Division, The Energy and Resources Institute, New Delhi; India showcased a case study on restoring Oil Spill/oil-contaminated site of Kuwait Oil Company. The petroleum industry effluents and oily sludge/spills cause a severe threat to the environment as their constituent compounds have toxic, mutagenic, and carcinogenic properties. The virtual webinar was attended by the faculty members, officers, staff and the research scholars of the institute.