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Microplastic pollution in tropical urban rivers has become an increasing environmental concern due to rapid urbanization, inadequate waste management, and hydrological transport processes. This study investigated the occurrence, characteristics, and spatiotemporal distribution of microplastics in the Can Tho River, Vietnam, along an urban– peri...

東南アジア地域における急速な都市化と消費拡大に伴い、プラスチック廃棄物の発生量が急増し、プラスチック汚染が特に深刻な課題となっている。ASEAN諸国では、使い捨てプラスチックの禁止、拡大生産者責任（EPR）制度、普及啓発キャンペーンなど、さまざまな対策が進められている。しかし、これらの対策だけでは、根強く定着した消費行動を変えるのは難しい。 利用制限や普及啓発だけで十分な効果が得られないような課題に対し、行動科学は有効な補完的アプローチとなる。Behaviour-Centred （行動に関する理解に基づく、行動に焦点を当てた）アプローチを取り入れることで、単なる情報提供や経済的インセンティブに頼るのではなく、「意図と行動のギャップ」を埋め、持続可能な行動変容を促すことができる。...

Salinity intrusion has become a critical threat to agricultural stability and water resource management in the Vietnamese Mekong Delta (VMD), particularly in coastal regions. This study evaluates the efficacy of the Long Short-Term Memory (LSTM) neural network, a sophisticated deep learning (DL) architecture, for predicting salinity concentrations...

Single-use plastic waste poses significant environmental challenges, particularly through microplastic pollution in aquatic ecosystems. In this study, a bio-carrier was fabricated from recycled single-use plastic waste, and its performance was evaluated in a laboratory-scale moving bed biofilm reactor combined with membrane filtration (MBBR-MBR)...

Using behavioral insights to increase reusable water bottle use Nopa Move’s Smart Bottle Network, with support from the Economic Research Institute for ASEAN and East Asia (ERIA), Institute for Global Environmental Strategies (IGES), and Rare, addressed single-use plastic waste in Ho Chi Minh City’s commuter coffee culture, where disposables...

Drought is a recurrent hazard in the Vietnamese Mekong Delta (VMD), with major implications for agriculture, water resources, and rural livelihoods. This study assesses drought variability in Kien Giang Province, Vietnam, from 1992 to 2024 using two multiscale indicators: the Multivariate Standardized Precipitation Index (MSPI) and the Multivariate...

Suspended sediment concentration (SSC) and sediment flux (SF) are critical indicators of sediment delivery in the Lower Mekong and underpin deltaic geomorphic stability and ecosystem services. With recent evidence of declining sediment supply caused by upstream regulation and intensive in-channel extraction, there is a pressing need for...

Plastic pollution is a growing challenge in Southeast Asia, where rapid urbanisation and rising consumption are driving sharp increases in plastic waste. While traditional regulations such as plastic bans and information campaigns are important, they often fail to shift deeply ingrained consumption and waste management habits on their own. This new...

　本報告書は、令和７年度環境省「途上国における優れた脱炭素･低炭素技術の普及展開に向けた制度構築等支援委託業務」の業務報告書である。 　本業務は、二国間クレジット制度（JCM）を活用した優れた脱炭素・低炭素技術の展開及びJCM プロジェクトを契機とした横展開や普及拡大を更に強化していくため、途上国の長期戦略の策定支援、NDC 更新・実施支援や、脱炭素都市の形成に向けた取り組み支援を行うとともに、それらの国・ 都市の市場の状況を踏まえ、途上国や都市における新たな制度・規制等の構築や既存制度の改善に着手することを目的として、以下の４課題を行った。 I．各国のNDC 更新並びに各国等の長期戦略策定等を見据えたAIM を活用したシナリオ分析及び脱炭素化に向けた戦略・制度構築支援 II...

The special session was co-organized by the Embassy of Japan in Thailand and the Ministry of the Environment, Japan, focuses on establishing and expanding an international metal resource circularity network through the proper treatment of e-waste between ASEAN and Japan. Dr. Hotta and Dr. Menikpura presented about lifecycle sustainability...