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While global resource use and GHG emissions keep increasing, the circular economy (CE) has ascended to the forefront of global policy, business and research agendas. Through narrower, slower, and more closed material cycles, the CE aims to avoid waste and reduce virgin raw material demand, thereby potentially also mitigating energy demand and GHG...

China, the world largest emitter of greenhouse gases, committed to realize carbon neutrality before 2060, accordingly, the country’s climate policies have been highly concerned. China’s emissions mitigation measures focused on regulations and financial support in the past. Along with a growing recognition on the advantages of market mechanisms, the...

Refuse-Derived Fuel (RDF) is gaining popularity in Indonesia as a promising solution for processing large volumes of municipal solid waste (MSW), extending landfill lifespans, and facilitating both material and thermal recycling. The quantity and quality of RDF are critically dependent on the input waste composition and the selection of materials...

生物多様性・生態系サービスのシナリオ・モデリングには、グローバルや国レベルの広域のものをダウンスケーリングして用いる事が多く、地域の文脈におけるシナリオの妥当性やモデリングの解像度に課題があった。本研究では、これまでの地域の課題や将来ビジョン、地域の関係者とのワークショップで得られた意見にNFFを適用し分類を行った。結果、地域の将来ビジョンとして、社会のための自然利用より、文化としての自然への関心が高いことが明らかになった。さらにこれら地域情報に基づく4つのシナリオナラティブと、これらのナラティブを定量的に表現するための指標のロングリストを作成した。今後、今回得られた定性的なシナリオ（ナラティブ）に基づく数理モデリングを進めるための指標の選択と指標データを用いた計算（ステップ２...

Through the lense of sustainable timber trade which I have forcused as a research topic, I proposed a possible solution to overcome the challenge in forest low implementation cost. In conclusion, when viewed through the lens of sustainable timber trade, a producer country's forest laws, the cost of strengthening forest law can be reframed. It is...

Various studies have been conducted on the barriers to climate change adaptation in specific contexts, but they often focus only on particular sectors. This research aims to comprehensively assess the barriers to climate change adaptation across various stakeholder sectors at the city level. The case study in Semarang City is expected to provide...

Critical energy transition minerals (CETMs) are vital for clean energy technologies, but their life cycle is associated with substantial environmental, social, and governance risks. These risks disproportionately affect local communities and countries in the Global South, where much of CETM extraction takes place. Despite bearing the burden of...

Landslides present a critical hazard in the Himalayas, where steep topography, intense rainfall, and tectonic activity converge to destabilize slopes. Accurate delineation of high-susceptibility zones is essential to safeguard lives, infrastructure, and ecosystems. Here, we construct a comprehensive Landslide Susceptibility Map (LSM) for...

At Osaka Expo 2025, EU pavillion organised nine in-person events over three days on circular economy. On September 23, 2025, the event organized a session on " Plastic planet: Innovating solutions for a cleaner tomorrow". Hotta of IGES was a panelist of the session. The session is available in Youtube.

The grand design has been formulated recently for the ‘Growth-oriented Carbon Pricing’ concept in Japan. The blended approach, combining voluntary participation of the businesses with phased regulatory enforcement, deserves attention due to its potential to serve as a model for other countries in Asia. This paper gives an overview of the latest...