World Environment Day WED on 5th June. Theme for 2018 is Beat Plastic Pollution and Host City is New Delhi, India. World Environment Day WED, First held on 5th June 1974, for raising awareness on emerging environmental issues and THEME is "Only one Earth" and Host City is Spokane, United States., Eco Day, Environment Day, Environment Protection, Environment, Stockholm Conference, Human Environment, UN General Assembly, List of Annual themes year-wise and Host City, World Environment Day Anthem, Nandani Tutorial, environmental issues, United Nation's