The Earth Hour 2021 campaign in Vietnam is implemented by the World Wide Fund for Nature (WWF), under the auspices of the Ministry of Industry and Trade. The main message of the campaign is speaking up for nature, focusing on two themes: Save energy-Reduce greenhouse gas emissions” and “No more plastic waste in the natural environment”. This year, a large number of young people participated in the event "Lights out day" at the BOO fashion store on Trang Tien street in response to Earth Hour. Here, young people brought their old clothes to exchange for other people's clothes. They will have a chance to experience an interesting recycling activity./.