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The global environmental governance landscape is undergoing a paradigmatic shift from state-centric pollution control to market-based Extended Producer Responsibility (EPR). This report provides an exhaustive analysis of the EPR landscape within the Indo-Pacific region, contrasting the mature, strict-liability frameworks of East Asia (Japan, South...

Decarbonizing road transport requires a socio-technological transition that integrates systemic changes in transport infrastructure, technological innovation, and broader societal transformation. Non-state actors—particularly sub-national governments and cities such as Jakarta Metropolitan City, West Java Province, and the City of Semarang—play a...

From "Islands of Excellence" to a "Sea of Change": How ASEAN's Secondary Cities are Localising the SDGs in the region As the ASEAN region rapidly urbanises, the focus often falls on its mega-cities. However, a quiet transformation is underway in the region’s secondary cities -- the agile urban centres that are proving to be fertile ground for...

Climate change and river flow alterations in the Mekong River have significantly exacerbated drought conditions in the Vietnamese Mekong Delta (VMD). Understanding the temporal dynamics and propagation mechanisms of drought, coupled with the compounded impacts of human activities, is crucial. This study analyzed meteorological (1992–2021) and...

This report provides a baseline assessment of Cambodia’s informal waste sector, with a focus on Phnom Penh and Battambang. Informal waste workers, including street pickers, door-to-door collectors, pickers at landfills and junkshop operators, play a critical yet undervalued role in the country’s waste management system. They are responsible for a...

ベトナムにおいて、2023年には推定438-441万トンの木質ペレットが製造された。 中部の工場はほぼ原木のみで製造。北部・南部の工場の多くは原木・残渣の両方を使用 原木の調達地域は、北部・中部（人工林面積が大きい）から南部までの全域。南部ではゴムや果樹が重要な資源となっていると考えられる 原木調達先の一部は天然林の減少がおきている地域（北部、中央高原）であるため 、違法伐採・森林減少リスクを回避するためには、調達する原木に天然木が混入していないか確認することが望ましい

This report evaluates a pilot project in Padang, Indonesia, that introduced the digital application to modernise community-based waste banks. The study explores how digital transformation can improve operational efficiency, data accuracy, and transparency within a circular economy framework. While the initiative successfully digitised thousands of...

Air pollution is Southeast Asia’s leading environmental health risk and a key driver of climate change through short-lived climate pollutants (SLCPs) such as black carbon and methane. The Southeast Asia Climate & Clean Air Initiative (SEACAI), co-financed by Germany and Switzerland, demonstrates how coordinated donor action can deliver tangible...

IGES's ASEAN NDC Database compiles the key elements of the Nationally Determined Contributions (NDCs), which are submitted by the ASEAN member states to the United Nations Framework Convention on Climate Change (UNFCCC). ASEAN member states are Brunei Darussalam, Cambodia, Indonesia, Lao DPR, Malaysia, Myanmar, Philippines, Singapore, Thailand and...

In Vietnam, where domestic wastewater significantly contributes to water pollution, innovative treatment solutions are urgently needed. This study assesses the effectiveness of subsurface horizontal flow constructed wetlands (CWs) for decentralized domestic wastewater treatment, focusing on systems planted with Napier grass (Pennisetum purpureum)...