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Asia has the world's largest population and the largest number of biogas digesters, with implementation across 25 countries. These countries can be categorised into four groups based on their biogas development status. Asia has approximately 45.03 million biogas digesters, of which about 99.72% are household units and 0.28% are industrial digesters. Predominantly located in less developed rural areas, a substantial number of household digesters have ceased operation or been abandoned. Some Asian countries and regions are witnessing a transition from household to industrial digesters, driven by economic growth and favourable environmental policies. However, many industrial digesters smaller than 500 m3 are underperforming, unprofitable, or inactive. Larger digesters are better managed and more sustainable. From 1958 through 2023, 163 biogas safety incidents were recorded in seven Asian countries, resulting in 321 fatalities, 220 injuries, and substantial property damage. This study identifies and discusses seven key factors influencing biogas development in Asia: climate conditions, energy demand, biowaste resources, economic development, government policy, technical service, and biogas programs. These factors range from objective and independent to external dependencies and direct, dynamic influences. Future biogas development in Asia will benefit from favourable technoeconomic growth and increased climate change awareness, supported by societal priorities and government policies. However, it must also confront and address several significant challenges. [Display omitted] • Biogas development activities have been in 25 Asian countries. • Asia has approximately 45.03 million biogas digesters and 99.72% are household units. • From 1958 through 2023, 163 biogas accidents resulted in 321 deaths and 220 injuries. • Seven key factors influence biogas development in Asia. • Future biogas development is optimistic, but challenges must be addressed. [ABSTRACT FROM AUTHOR]

This comparative case study of three Asian cities (Penghu in Taiwan, Seoul in South Korea and Tianjin in China) elucidates the effects of different national approaches to eco-city development and the antecedents of the building of an eco-city. To better understand the Asian context, the three Asian cities of interest were compared with two European cities – Freiburg (Germany) and Samsö (Denmark). The effects of the approach to the development of an eco-city and the fitting of its business activities to the local context are investigated. The analysis identifies four transforming antecedents of the development of an eco-city in Asia, which are (1) utilization of a national approach and policy, (2) the presence of a dedicated local public authority, (3) the continuous engagement of local citizens, and (4) an infusion of national capability and business activity. The transformational development of an eco-city in Asia seeks to create a new techno-social regime that is based on sustainable solutions, whereas their respective national capabilities must be emphasized with an eye to efficiency, economy, and effectiveness simultaneously. [ABSTRACT FROM AUTHOR]

Asia's unprecedented economic growth and reduction in the number of poor people is fuelled mainly by industrial expansion. This growth is unsustainable unless the associated environmental impacts are significantly reduced. Resource and energy efficiency is a practical way for industry to achieve this. However, current efforts are not sufficient to capitalise on the huge energy efficiency potential, as barriers exist including low company management awareness, limited knowledge and information, lack of financing, and conflicting policies combined with weak enforcement. This paper discusses and illustrates these barriers with real-life examples from Asian companies, including China. To ensure continued energy efficiency in Asian industry it is recommended to increase management awareness, establish an organisational infrastructure for energy efficiency cooperation, invest in financial mechanisms to fund energy efficiency projects, and expand and amend policies. It is also essential to improve efficiency of other resources, especially water. As a first step, an efficiency guide was produced as part of the Greenhouse Gas Emission Reduction from Industry in Asia (GERIAP) project. Without these efforts, poverty in Asia in the long term is likely to increase rather than decrease. [ABSTRACT FROM AUTHOR]