A grand welcome to all the participants from all over the world to exchange their views towards nature and who served for nature in the glorious opening of 5th World Congress on Environmental Science scheduled in Las Vegas, USA during July 15-16, 2019. Enormous arrangements are done for plenary lectures, keynote talks, courses by eminent personalities from around the world in addition to poster presentations, young researcher sessions, symposiums, workshops, and Exhibitions with the theme: “Integrative Approach towards Environmental Challenges” to realise ample opportunities for resolving the challenges.