Climate change induced sea-level rise (SLR) is on its increase globally. Regionally the lowlands of China, Vietnam, Bangladesh, and islands of the Malaysian, Indonesian and Philippine archipelagos are among the world’s most threatened regions. Sea-level rise has major impacts on the ecosystems and society. It threatens coastal populations, economic activities, and fragile ecosystems as mangroves, coastal salt-marches and wetlands. This paper provides a summary of the current state of knowledge of sea level-rise and its effects on both human and natural ecosystems. The focus is on coastal urban areas and low lying deltas in South-East Asia and Vietnam, as one of the most threatened areas in the world. About 3 mm per year reflects the growing consensus on the average SLR worldwide. The trend speeds up during recent decades. The figures are subject to local, temporal and methodological variation. In Vietnam the average values of 3.3 mm per year during the 1993-2014 period are above the worldwide average. Although a basic conceptual understanding exists that the increasing global frequency of the strongest tropical cyclones is related with the increasing temperature and SLR, this relationship is insufficiently understood. Moreover the precise, complex environmental, economic, social, and health impacts are currently unclear. SLR, storms and changing precipitation patterns increase flood risks, in particular in urban areas. Part of the current scientific debate is on how urban agglomeration can be made more resilient to flood risks. Where originally mainly technical interventions dominated this discussion, it becomes increasingly clear that proactive special planning, flood defense, flood risk mitigation, flood preparation, and flood recovery are important, but costly instruments. Next to the main focus on SLR and its effects on resilience, the paper reviews main SLR associated impacts: Floods and inundation, salinization, shoreline change, and effects on mangroves and wetlands. The hazards of SLR related floods increase fastest in urban areas. This is related with both the increasing surface major cities are expected to occupy during the decades to come and the increasing coastal population. In particular Asia and its megacities in the southern part of the continent are increasingly at risk. The discussion points to complexity, inter-disciplinarity, and the related uncertainty, as core characteristics. An integrated combination of mitigation, adaptation and resilience measures is currently considered as the most indicated way to resist SLR today and in the near future.References Aerts J.C.J.H., Hassan A., Savenije H.H.G., Khan M.F., 2000. 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Green cities" offer a systematic approach to a significant part of the nowadays urban complexity. The concept dovetails in the "healthy city" idea launched by the World Health Organization, but is equally associated with "sustainable" and "smart cities". During the past decades planning for "green cities" shifted, incorporating new ideas as sustainable development and IT-driven management instruments for smart cities. Contemporary cities continue to face major environmental challenges. Replying to this dynamic context is a main task for cities during the coming decades of the millennium. As most of the (major) cities worldwide are located at the edge of the continents, supporting water-bound activities, they show a significant "blue economy" aspect. This paper reviews the historical context of the science aspects of "green cities" and the related approaches. Four main challenges for livable (coastal) cities today are discussed, taking into account the continuous changes and the almost permanent transition cities face. Climate change effects as sea level rise and extreme weather conditions, affect directly coastal cities; providing enough drinking water is a long standing and increasing problem; ports face particular and specific environmental problems which are in need of a tailored management; and sufficient accessible green areas remain of primary concern for any green city. Cross cutting through these issues are among others mobility and sustainable urban design. These major challenges will necessitate new processes of decision making. Long term planning is essential. This includes among others green infrastructure, systematic investment in natural areas (both on land and in the marine environment), cleaner technology innovations (on water treatment, low carbon emission technology, advanced waste prevention and treatment management, green roofs, and (artificial) wetlands), and the use of smart, IT-driven solutions.

The main purpose of this study is to examine the farmers' intention of pesticide use by using a combination of the theory of planned behavior, the expected utility theory, and the diffusion of innovation theory. The data were collected from 362 farmers in Quang Nam from April to December 2020 and were analyzed by a structural equation model. The analysis results show that farmers' intention to use pesticides is affected by many variable groups from the above theories. The combination of these theories limits the disadvantages of applying only one theory into studying the farmers’ intentions of pesticide use.

Tourism has become a leading economic sector in Vietnam, is termed a "smokeless business," and generates substantial money for the government. However, the present complex evolution of the Covid-19 epidemic has had a significant effect on the whole Industry. Tourism models must be bolstered by the variety of Vietnam's ecosystems, wildlife, and cultural heritage. Nonetheless, the complex dynamics of the present Covid-19 outbreak have had a significant influence on Vietnam's whole tourism economy. Many hotels, restaurants, and retail chains in tourist sites become empty as a result of flight bans, travel restrictions, and tourists' dread of the pandemic's effects. This forewarns of a decline in the tourist industry's earnings in numerous nations, including Vietnam. By synthesising statistics, this article evaluates the influence of the Covid-19 pandemic on tourist development in Vietnam and makes some recommendations for the post-Covid-19 sustainable growth of Vietnam's tourism business.

This research assesses the satisfaction of people to the urban waste classification at source as an effective waste management method. There was a survey via google form that was sent to emails of 450 people in Hai Chau District, Da Nang city, from July 20th, 2021 to August 5th, 2021. Using the structural equation modeling (SEM), the study showed that the facilities of waste classification, expectations of residents, service quality, and perceived value were all statistically significant. In addition, this study also found that it is the responsibility of the local government that has been demonstrated over the years, from paying attention to waste treatment and investing in physical facilities to being at the forefront of different movements of categorizing plastic waste, has created more trust, satisfaction, and support of the people to the movements proposed by the city. The results also show that, when the community is satisfied with the garbage classifying activity, it will create enthusiasm, active participation, and social interaction - community cohesion in the waste classification. The research provides additional evidence on the satisfaction of people to the movement of waste classification at source in Hai Chau district. The study also contributes a part theoretically and provides some implications for managers, citizens, and further researches.