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The use of biomass crops as an energy source is frequently mentioned as an option to reduce CO 2 emissions. To evaluate the possibilities reliable yield estimates of biomass crops are required. In this paper a simple method is developed to estimate regional yields of various biomass crops, based on the linear relation between intercepted light and biomass production. The quality of the estimates was studied by using the method to estimate yields of several agricultural crops in two regions in The Netherlands. In general a deviation of less than 10 % was found between actual and estimated average yield.
Past climate changes have led to considerable changes in the species composition of ecosystems. The recent increase in average global temperature is rather strong compared to previous warming periods and, if climate models are correct, future warming will be even stronger. Especially in Europe where the landscape has been greatly fragmented by human activities, the ongoing and projected changes in climate will pose an additional stress on the natural biodiversity. This paper will discuss a method for the selection of bio-indicators to assess the possible landscape-ecological effects of climate change, and presents some preliminary results of the selection of indicator species for the Netherlands.
To assess the economic consequences of environmental taxation a general equilibrium model is applied. The model contains 60 firm sectors and 44 household groups, which makes it especially suitable to analyse the sectoral and distributional effects of environmental taxes. These sectoral effects are rather large and diverse in comparison to the macro-economic consequences. After a short overview of the relevant literature, the original model and the model adaptations are described. These model adaptations include an iterative procedure to avoid substantial linearisation errors when large impulses are simulated. Possible model simulations are identified and the working programme is presented.
We completed nine focus groups on perceptions of powerline right-of-way (ROW) management issues. In these groups we interviewed eastern Tennessee residents to determine the nature and range of knowledge and views regarding vegetation management, ROWs as wildlife habitat, and ROW aesthetics. We also conducted an extensive literature review to adduce other pertinent data. Participants in focus groups exhibited a wide range of attitudes and beliefs about the interview topics. Some associated wildlife habitat with areas devoid of humans ("wilderness" or "sanctuary"), whereas others thought of habitat as close as "my backyard." A majority referred to habitat in relatively objective terms such as "food, water, and cover"...
We completed nine focus groups on perceptions of powerline right-of-way (ROW) management issues. In these groups we interviewed eastern Tennessee residents to determine the nature and range of knowledge and views regarding vegetation management, ROWs as wildlife habitat, and ROW aesthetics. We also conducted an extensive literature review to adduce other pertinent data. Participants in focus groups exhibited a wide range of attitudes and beliefs about the interview topics. Some associated wildlife habitat with areas devoid of humans ("wilderness" or "sanctuary"), whereas others thought of habitat as close as "my backyard." A majority referred to habitat in relatively objective terms such as "food, water, and cover"...