[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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In this study, the utilization potential of wood materials as the structural glued laminated timber was estimated for bridges managed by Wakayama Prefecture based on the medium- and long-term renewal demand, considering the soundness and lifetime of the bridges. We also evaluated the effect of the replacement of the existing concrete and steel bridges by wooden bridges on GHG emission reduction. As a result of the analysis, it was found that 1) the replacement of existing bridges with wooden bridges could create medium- to long-term demand for timber, 2) due to the replacement of bridges with a length of less than 30 meters by wooden bridges, the cumulative demand for wood in Wakayama Prefecture from 2030 to 2050 could increase by 17% from the amount of wood production in 2020, and 3) the utilization of wood materials for major parts of bridges replaced could reduce GHG emissions by approximately 26% compared to the utilization of conventional construction materials.

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In Lake Biwa basin, various citizens' activities are being promoted for sustainable society based on the Mother Lake Goals (MLGs). This study aimed to clarify the factors affecting factors affecting the attachment to the lake and residential area to those citizens’ activities. The questionnaire survey was conducted for Shiga prefectural residents, and the obtained data were analyzed by covariance structure model. As a results, attachment to lake and the residential area affected on the willingness to act for MLGs directly. On the other hand, the attachment influenced the actual behavior through the interest in lake basin environmental conservation indirectly.

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Contrary to the indispensable roles of environmental conservation NPOs, diversity in their activity fields is not given attention. In Japan, no source lists the number of organizations working in each field such as forest conservation or waste reduction. Therefore, this study attempts to estimate them using quantitative text analysis of the organizational purpose mentioned in the articles of incorporation. Based on our analysis, 7,708 NPOs having environmental conservation as their purpose exist in Japan. Further, their activity fields were found to change based on the establishment period.

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