The subject of this paper is to estimate consumers' welfare loss when the BSE testing age criterion for cattle is revised from all months to older than 21 months, by analyzing the change in meat demand due to this revision. However this analysis is different from ordinary revealed preference methods in that the demand data after this policy change are stated, while the data before this change are revealed as usual. This is because this paper focuses on a policy change which is not substantially executed yet. To collect such a data set, I conducted a survey for 206 homemaker monitors for a month, where each household's current purchase quantity and purchase amount of Japanese beef, American beef, Australian beef, pork and chicken was recorded. After this survey, an additional questionnaire survey was also carried out,where I questioned the monitors on their purchase quantity of each commodity under the hypothetical situation that the revision of the BSE testing age criterion has been executed. At this question, I provided each monitor with her own purchase quantity in the previous survey period as a reference point in order not to largely lose the reliability of the stated data. Using this demand data whose aggregation level is household, I estimated the generalized corner solu-tion model of Phaneuf et al. (2000) for an incomplete demand system model. When I simulated each monitor's welfare loss based on the model estimation result, the expected compensating variation per household per month was 214 yen at the sample mean and 55 yen at the sample median.

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　This paper aims to discuss the current research situation and new directions in valuing environmental resources. Although environmental valuation research is frequently published in many journals, there are few actual environment policies for which environmental valuation has been used other than project evaluation. We would like to consider the criticism of environmental valuation and then search for new application possibilities. For this, we survey studies on measuring sustainable development in relation to valuing environment resources. We especially discuss the new theory of sustainable development which considers the specific characteristics of natural capital, like resilience and weak substitutability. Finally, we discuss environmental valuation in relation to the new theory of sustainable development.

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　In recent years, the global economies have been faced with steeply rising prices. The members of World Bank and the United Nations including WFP (World Food Program) appeal to the world for necessary food emergency aid programs so that people in poverty might be prevented from being troubled by food shortages. Developed countries, such as Japan, the EU and the United States, comply with the world demand. One of the causes of the steeply rising price of food are the money inflow into the commodity futures market from the oil market and the investment market for housing at the United States. The changing food demand of BRICs, in which Brazil, Russia, India and China are involved, and emerging economies is the biggest factor of steep rising price of food. This will bring the structural change into the world food market.
　The fourth report of IPCC (Intergovernmental Panel on Climate Change) indicates the possibility of drought, temporary flooding, water shortage and transition of suitable land on agricultural production in the future. Agricultural production is not only carried through under these global environmental problems but also the effects of agricultural production on the global environment have to be minimized.
　The aim of this paper is to consider the possibility of attaining the sustainable agricultural production, which may minimize the influence of agricultural production on the global environment and which may keep pace with changing food demand and population increase by reviewing present studies, especially those focusing on biofuels and water issues. The sustainability science perspective is appropriated in order to consider the shape of sustainable agricultural production.

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