Keisuke Hanaki

Climate change-induced floods in tropical urban areas have presented a serious global challenge because of failed conventional stormwater management practices. This research aims to develop a comprehensive methodological framework for flood damage estimation and mitigation, particularly in a tropical urban city. In this study, interdisciplinary fie...

In order to adopt environmentally friendly modes of actions, pro-environmental behaviors (PEBs) have been promoted in many countries to improve people’s consumption patterns and lifestyles in a sustainable manner. The current practices and influential factors of people can differ by country, but related studies in the Asian region are limited. The...

Video-type information provision can be one of the strategies for enhancing people's attitudes and behavior in environmentally friendly directions. Previous studies have only investigated the overall effects on people's attitudes, so the kinds of technical expressions in videos that are effective for enhancing attitudes and intentions for global wa...

Climate change has been one of the central issues for long-term transformations of cities. However, environmental loads have not been effectively taken into account for future urban plans. Specifically, possible reductions of carbon emissions from cities significantly rely on technological progress and human lifestyle changes, among other factors,...

Current deteriorating air quality has become a severe threat for human health in the past several years in China. However, the insufficient understanding of public pro-environmental intentions and behaviors has become a barrier to implementing appropriate regulations for air quality improvement. This study aimed to seek the determinants of resident...

Fossil fuel consumption is a major cause of climate change. Biofuels can reduce the consumption of fossil fuels and thus reduce carbon dioxide emissions, because biofuels are carbon neutral. More specifically, the carbon dioxide that is emitted when a biofuel is burned merely returns to the atmospheric carbon dioxide that was taken into plants from...

In this paper, the potential of regional-scale introduction of agrivoltaic systems (the technique to put up a pillar on agricultural land, and to install PV systems in upper space of the pillar continuing farming) was evaluated. Considering the difference of adaptability to the decrease of solar radiation under agrivoltaic systems between agricultu...

This study focuses on urban and rural house dwellers' opinions about their own as well as commercial, industrial and agricultural water use and pollution issues in Dhaka, Bangladesh. One hundred respondents were asked to make comparative choices on five water use sectors arranged in pairs, about five water issues regarding water shortage, earning mon...

Fostering pro-environmental behaviors (PEBs) is a critical step towards achieving sustainable societies, and has become a great challenge for both developed and developing nations. However, understanding of PEBs from the perspective of developing countries is scant. Considering this limitation, the present study aimed to provide some insights into...

With an ever-increasing urban population, promoting public health and well-being in towns and cities is a major challenge. Previous research has suggested that participating in allotment gardening delivers a wide range of health benefits. However, evidence from quantitative analyses is still scarce. Here, we quantify the effects, if any, of partici...

Today's children have less direct contact with nature than ever before, resulting in an ?extinction of experience?. Research has suggested that such loss of daily interactions decreases people's appreciation of the natural world, but this remains quantitatively unexplored. We conducted a questionnaire survey of undergraduate university students in...

This paper presents findings on variations in human thermoregulatory response due to demography and anthropometry by studying different subjects during periods of rest, moderate walking and recovery. Sixteen subjects participated in the present study. Controlled experiments were conducted under similar environmental conditions (ambient air temperat...

The climate change research community has developed shared socioeconomic pathways (SSPs) that can be applied to a diverse range of climate research throughout the world (Moss et al., 2010; van Vuuren et al., 2014; O’Neill et al., 2014., Kriegler et al., 2014). However, the regional scenario specifically for cities is also increasing in importance s...

Children are becoming less likely to have direct contact with nature. This ongoing loss of human interactions with nature, the extinction of experience, is viewed as one of the most fundamental obstacles to addressing global environmental challenges. However, the consequences for biodiversity conservation have been examined very little. Here, we co...

The gap between people's attitude and action as regards environmental issues has been pointed out even while surveys registered an increase in people's environmental awareness. Among the possible reasons is that people tend to automatically answer "yes", as most surveys on environmental consciousness use positively-phrased questions or prompts. To...

The compact city paradigm claims to result in a better urban quality of life (UQoL). However, does it also resonate for cities that are already compact (i.e., highly dense)? This study empirically assesses the degree of association between the compact urban form (UF) and better UQoL at the neighbourhood scale in the case of Kolkata, an expanding, h...

The resource consumption pattern of remote islands is assumed to be different from that of the main land due to the constraints of both material distribution and human interaction. This study aims to investigate food production and consumption pattern of remote islands with an attention to flow of food supply and food stock for emergencies through...

Objective. The objective of this study is to comprehend how much environment-related issues are dealt in the current home economics in full detail to examine the possibility of introducing Life Cycle Thinking (LCT) into curriculum of home economics. The authors applied text mining to plural home economics textbooks from the elementary school to the...

To address issues of poor sanitation and water scarcity in developing countries, innovative wastewater management systems should be proposed, based on considerations of life cycle and local environmental impacts. Source-separation separates urine, feces, and gray water, enhancing the reuse of nutrients, and is considered a promising wastewater trea...

Various Smart City projects have been carried out all over the world. However, the cases achieving both the environmental and economic improvements are quite rare and most of the projects cannot continue without the subsidies from their governments. Besides, most of the projects focus on a single zoning area, and Smart Grid application correspondin...

This study presents a comparative analysis between Jatropha seed production systems to generate bioelectricity versus production of biodiesel under current and optimised conditions. An LCA (life cycle assessment) has been developed, comprising both upstream and downstream processes, encompassing the farming, collection, fuel processing and usage ph...

The Edo Castle is located in central Tokyo and its Outer Moat provides a precious water environment in the urban area. The water sources are limited to precipitation and combined sewer overflow (CSO); therefore, the hydraulic retention time (HRT) becomes very long (tens of days), resulting in the poor water quality. Particularly in summer, serious...

To reduce the environmental load of the household sector, it is important to enhance people's pro- environmental behaviors (PEBs). Information provision has been considered as one of the possi- ble methods for fostering PEBs. However, previous studies have seldom discussed what type of information is most appropriate for the target behavior. Effect...

Influential factors on food risk perception were investigated from the viewpoints of socio-demographics, lifestyles and personalities. The anxieties about 24 types of food based on six product areas and four food types were investigated through the questionnaire survey getting 16,650 respondents in Japan. Besides, 60 questions were prepared to inve...

Because water use systems include a variety of stakeholders, we must present multiple alternative plans that to diverse preferences. Hence, we prepared multiple evaluation axes of water use systems. We developed multi-objective optimization systems that to caluculate multiple alternatives of water use systems by using evaluation model of multiple a...

Life cycle assessment (LCA) is one of the most widely used methods of decision support. However, few studies have examined whether stakeholders prefer midpoint or endpoint approaches. In this regard, the present study examines the attitudes toward urban solid waste management, envi-ronmental issues, and scenario evaluations by using midpoint and en...

Facing the challenge of global warming, greater importance has been placed on learning energy and environment in schools and the energy-saving behaviors of children and their families are encouraged. The authors implemented energy environmental education programs with visualization in elementary and junior high schools, and surveyed changes in the...

This study is an attempt to develop an internationally applicable compact city index that measures the performance of physical urban forms with regard to compact city policies. Based on key characteristics of the compact city that are high density, mixed land-use, and public transport systems, we formulate a new index called ‘compact city index’ (C...

In recent years various environmental programs have been conducted to address climate change. However, CO2 emission reduction derived from people's behavioral change has rarely been quantitatively-analyzed after programs. In this paper, the community-level energy/environment learning approach and the formulation for metric evaluation were proposed...

The recycling of anthropogenic nutrients derived from the wastewater management systems is often characterized by a complex and uncertain scenario, due not only to the nature of the process but also to the involvement of different stakeholder groups. Over the past 10 years in Switzerland, policies regarding the use of sewage sludge as fertilizer ha...

In this study, several types of adaptive network-based fuzzy inference system (ANFIS) with different membership functions (MFs) and artificial neural network (ANN) were employed to predict hourly photochemical oxidants that were oxidizing substances such as ozone and peroxiacetyl nitrate produced by photochemical reactions. The results indicated th...

In this study, seven types of first-order and one-variable grey differential equation model (abbreviated as GM (1, 1) model) were used to forecast hourly roadside particulate matter (PM) including PM10 and PM2.5 concentrations in Taipei County of Taiwan. Their forecasting performance was also compared. The results indicated that the minimum mean ab...

The Graduate Program in Sustainability Science under the Department of Urban Engineering of The University of Tokyo has been running an environmental leadership education program at the graduate student level since 2007 called the Asian Program for Incubation of Environmental Leaders (APIEL). This book describes the University s experiences in esta...

With increasing importance of global-scale environmental issues in addition to regional environmental issues, an analysis of life-cycle environmental impacts becomes essential to the management of basin-scale artificial water use systems. In this study, we evaluate the life-cycle environmental impacts, i.e., global warming potential, acidification...

This chapter outlines the features of the Asian Program for Incubation of Environmental Leaders (APIEL), including its objectives, core concepts and curriculum structure. APIEL is an educational program developed by The University of Tokyo that aims to foster environmental leaders, who have wide knowledge base, critical perspective, and a strong et...

Decision making in sanitation planning is often complex, with inherent trade‐offs among sociopolitical, environmental, technical and economic factors. The selection of appropriate and sustainable sanitation systems for municipal wastewater treatment involves multiple criteria with conflicting stakeholder preferences. To fulfil conflicting yet compl...

抄録 本研究では，飲料水のリスクに関する様々な情報が消費者のリスク認知に対してどのように影響するのかを，提供情報の内容，個人特性，個人属性に着目して評価した。回答者は提供情報の組み合わせにより11グループに分けた。情報を提供しなかったグループに比べ，情報を提供した全てのグループで未知性因子得点が低くなる効果が見られた一方で，恐ろしさ因子得点が高くなった。また，集団感染事例やDALYなどの数値情報によるリスク認知への影響は大きくなかったが，特に集団感染事例についてはその数値の捉え方によって人々のリスク認知が異なることが明らかとなった。さらに，個人特性によるリスク認知への影響として，「無謀さ」などのリスクに対して能動的かつ積極的に対応する因子が大きいほど，恐ろしさ因子が大きくなる傾向が見られ，さ...

Objective. There are two kinds of limitations in the current input-output table (IOT) from the point of view of environmental impact assessment caused by road transport. Firstly, only two sectors are defined for freight transport on road in the IOT. Secondly, only monetary transaction data are available and quantity transaction data are not provide...

In the context of the “Alliance for Global Sustainability” (AGS)—a research partnership between ETH Zurich, MIT in Boston and the University of Tokyo—a cooperative project with the city of Guangzhou in South China was established in the year 2000. Its goal is to support the city of Guangzhou in addressing problems of sustainable development related...

More than 50% of the global population already lives in urban settlements and urban areas are projected to absorb almost all the global population growth to 2050, amounting to some additional three billion people. Over the next decades the increase in rural population in many developing countries will be overshadowed by population flows to cities....

Understanding waste prevention behaviour (WPB) could enable local governments and decision makers to design more-effective policies for reducing the amount of waste that is generated. By merging well-known attitude-behaviour theories with elements from wider models from environmental psychology, an extensive cognitive framework that provides new an...

To evaluate the cost effectiveness of rice husk utilization, a life cycle cost analysis was conducted for 18 scenarios developed in a previous study. The allocation of fuels other than rice husks was decided on the basis of current demand for and supply of rice husks. The production of rice husk briquettes is also discussed as a means of circumvent...

Citizen's preference of residential site choice was examined and analyzed to reflect such preference in changing the urban form toward the realization of the sustainable society. Diversity and characteristics of preference were examined by questionnaire survey for the residents who have moved within the last 10 years in Usutunomiya City. Three majo...

Sotobori moat, made outside in the Edo castle for its defense in 17th century, has various values not only of a waterfront space but also historical ruins, which values are widely recognized by residents near and far from Sotobori moat. The aim of this study is to analyze the citizen's preferences of "use values" (direct/non-direct) and "non-use va...

Concerning CO2 emissions related to infrastructure development, common calculation methodology has not been certified. Common calculation methodology is necessary to know effective approach toward total CO2 emissions reduction. In this study, we develop a calculation method of CO2 emissions related to infrastructure development and propose it as co...

Heat mitigation projects, such as green roof, waterfront, mist spraying and water-retentive pavement, are mainly intended to decrease outdoor temperature, while some of them have multiple utilities including increase of species, mitigation of flood, improvement of spatial design and environmental enlightenment in addition to decrease in outdoor tem...

The Air Pollution Control Act (APCA) of Taiwan signed in 1975 prescribes themaximum permissible limits of motor vehicle exhausts as well as the monitoring of airpollution, etc. In this study, the concentrations of air pollutants including SO2, CO, O3,PM10, NO2, and non-methane hydrocarbons (NMHC) from background air pollutionmonitoring stations (BA...

To evaluate the greenhouse gas (GHG) emission mitigation potential of rice husk utiliza-tion, a life cycle inventory analysis was conducted for 18 scenarios. The allocation of fuels, other than rice husks, was decided based on the current demand for and supply of rice husks. To prevent the bulky nature of rice husks, briquette production is also di...

Purpose Few studies have examined differing interpretations of life cycle impact assessment (LCIA) results between midpoints and endpoints for the same systems. This paper focuses on the LCIA of municipal solid waste (MSW) systems by taking both the midpoint and endpoint approaches and uses LIME (Life Cycle Impact Assessment Method based on Endpoin...

Here we propose a method to quantitatively assess and examine Global No Net Loss (GNNL) of forest biodiversity on a global scale. The method produces a GNNL index of existing forest and enables future predictions of forest loss under different assumptions. The method tests the feasibility of the GNNL index and enables discussion of policy for futur...

This paper examines the factors that influence the waste generation and willingness to minimise solid waste in Dhaka city, Bangladesh. Information on waste generation, willingness to minimise, socio-economic characteristics, and behaviour of the households towards solid waste management were obtained from interviews with 402 households in Dhaka cit...

This study analyzed the net carbon dioxide (CO) emission reductions between 2005 and 2050 by using wood for energy under various scenarios of forest management and energy conversion technology in Japan, considering both CO emission reductions from replacement of fossil fuels and changes in carbon storage in forests. According to our model, wood pro...

A model employing latent class analysis and the latent segment logit theory was developed to evaluate how the monetary values of a riverfront are influenced by the functions of rivers and by residents' awareness of rivers. The data for analysis were collected using online questionnaires sent to residents in a suburban area of Tokyo. The valuation o...

There are few public data sources for energy which are consumed at university facilities in Japan. So the authors have surveyed such energy data as have been stored in sixty national universities and have also collected the energy data in details only for the University of Tokyo. This paper describes some aspects which were analyzed and derived fro...

Selection of sustainable wastewater treatment scenarios under different local contexts is a complex process because of the inherent trade-offs among socio-economic, environmental and technical as well as functional factors. In order to fulfill conflicting yet complementary objectives, an integrated and systematic approach called the "multi-criteria...

Information on waste generation, socioeconomic characteristics, and willingness of the households to separate waste was obtained from interviews with 402 respondents in Dhaka city. Ordinary least square regression was used to determine the dominant factors that might influence the waste generation of the households. The results showed that the wast...

This paper analyzes the amount and characteristics of municipal solid waste (MSW) according to the inhabitant density of population and the business concentration in 25 districts in Seoul. Further, the heat energy recovery and avoided CO(2) emissions of four incineration plants located in residential and commercial areas in Seoul are examined. The...

Energy-saving technologies’ applicability to making cities more environmentally sustainable can be strongly influenced by the city's form, building uses and their density pattern. Technological developments have clearly shown specific urban forms to be more conducive to installing certain mitigation technologies. In this study, the capacity for imp...

A sulfur denitrification process was applied to actual agricultural fields and the characteristics of the treatment were evaluated from the viewpoints of water quality and microbial community. Nitrate was almost completely removed by the containers packed with sulfur (S0)-CaCO3 blocks at both sites. An increase in sulfate levels indicated that nitr...

Potential biodiesel production was evaluated by assuming that waste and cutover forestlands and burnt site areas, equivalent to 5.94% of China’s land area, were used to cultivate the most suitable energy crop in each province of China. Jatropha, Xanthoceras, Pistacia, and Swida were the candidate energy crops in that order of priority based on yiel...

Information on waste generation, socio economic characteristics and willingness of the households towards waste separation of waste were obtained from interviews with 402 respondents in Dhaka city. Ordinary Least Square (OLS) regression was used to determine the dominant factors that might influence the waste generation of the households. The resul...

This paper examines the factors that might influence recycling behaviour of the households in Dhaka city, Bangladesh. Information on recycling activity, socio-economic characteristics, and attitudes of the households towards recycling were obtained from interviews with 456 households in Dhaka. Logistic regression analysis was used to determine the...

Despite some progress, municipal solid waste (MSW) still poses pressure on cities and remains one of the major challenges in environmental management. There is no single solution to the problem since the drivers behind MSW systems may vary significantly from city to city. In this context, the development of a common strategy to attain a sustainable...

下水熱利用の地域冷暖房（DHC）システムの導入効果を定量的に解析するため，下水幹線モデルおよびDHCモデルが開発されている．これらを仮想地区に適用した結果，熱供給の対象となる建物が業務，宿泊，医療施設の場合においてCO2排出削減率が高く，CO2排出削減コストが低いことが分かった．また，東京都区部全体にモデルを適用し，地区特性の異なる様々な地区での下水熱利用効果の定量的評価を行うと共に，区部全体におけるCO2排出削減ポテンシャルの推計を行った．区部内320ヶ所のDHCの導入により年間約14万トン，区部内の民生部門のCO2排出量の約0.54%のCO2排出削減ポテンシャルを有していることが分かった．また，このときのCO2排出削減コストは平均でCO21トンあたり約16,800円であることが分かった．

The University of Tokyo (Todai) initiated a project called "Todai Sustainable Campus Project (TSCP)" which aims at formation of sustainable campus with involvement of its students as well as collaboration with other universities. The university sets target of CO2 emission reduction by 15% in fiscal year 2012 in compared with fiscal year 2006 as TSC...

This article was submitted without an abstract, please refer to the full-text PDF file.

This article was submitted without an abstract, please refer to the full-text PDF file.

都市河川の水辺環境改善を目的とした排水処理施設整備施策の比較を行った．水質，水量，施設整備による消費エネルギーの変化に着目し，整備に係る費用と，整備によってもたらされる水辺環境改善の便益を分析した．便益は，コンジョイント分析で得た限界支払意思額をもとに算出した．費用便益分析（評価期間50年）の結果，シナリオ 1（流域下水道＋合併浄化槽）とシナリオ 4（流域下水道＋分散下水道）は，純現在価値がそれぞれ246億円，291億円となった．一方で，シナリオ 2（流域下水道のみ）とシナリオ 3（流域下水道＋高度合併浄化槽）では，純現在価値が負に算定された．これらのことから，住民は，水質・水量の双方が改善できるシナリオを支持し，河川水量が低下するシナリオや，消費エネルギーが大きいシナリオは支持しないことが...

Greenhouse gas emissions from the waste sector account for only 4% of the total production, with wastewater management accounting for accurately 8 to 10% of this contribution. Wastewater disposal and treatment activities, mainly contributes to non-CO2 gases such as methane (CH4) and nitrous oxide (N2O). Capturing or avoiding these emissions is thus...

This paper presents analytical hierarchical process (AHP) in combination with life cycle assessment (LCA) as a decision support tool for municipal solid waste (MSW) management. A proposed set of treatment plans and an array of impacts create a complex decision environment for MSW management in the city of Boston. AHP is utilized to incorporate the...