Agoda survey cites key measures for sustainable tourism growth 09:18 | 07/06/2021 Overtourism, deforestation for tourism and the use of single-use plastic products are top concerns for tourism sector in Vietnam and many other countries, according to the Sustainable Travel Trends Survey launched by the world leading online travel platform Agoda on the occasion of the World Environment Day 2021 (June 5). A bird view of Cat Ba archipelago (Photo: VNA) HCM City â Overtourism, deforestation for tourism and the use of single-use plastic products are top concerns for tourism sector in Vietnam and many other countries, according to the Sustainable Travel Trends Survey launched by the world leading online travel platform Agoda on the occasion of the World Environment Day 2021 (June 5).