Estimating Traffic Emissions Using Demographic and Socio-Economic Variables in 18 Chilean Urban Areas

A macro-scale methodology for vehicle emissions estimation is described. The methodology is based on both correlations between activity level and PM, CO, THC and NO _x vehicle emissions and relationships between demographic and socio-economic variables and transportation activity level. First, pollutant emissions were correlated with transportation activity, expressed as vehicle-km/year, using existing data collected from mobile sources emission inventories in nine urban cities of Chile. Second, demographic and socio-economic variables were pre-selected from those that could intuitively be correlated with vehicle activity level and considering the data availability. Using the individual R ² correlation coefficient as variable selection criterion, population, the number of vehicles, fuel consumption, gross domestic product, average family incomes and road kilometers were finally chosen. A different set of explicative variables was considered for different vehicle categories, based on the selection criterion above mentioned. Then, correlation functions between these variables and transport activity were obtained by non-linear Gauss–Newton least square method. This methodology was applied to eighteen provinces of the country obtaining total annual emission for mobile sources, divided into six main vehicles categories.     

Completing the Picture: The Challenges of Bringing “Consumption” into the Population–Environment Equation

The issue of environmentally significant consumption is closely linked to population–environment relationships, but with some exceptions the two literatures have proceeded along separate tracks. We explore three consumption–environment research agendas: household–level consumption; ecological footprints and material flow accounting; and values, attitudes, behaviors and lifestyles. In each of these we note areas of overlap with the population–environment literature, and ways in which the population–environment literature might benefit or borrow from conceptual or methodological approaches in the consumption–environment literature. We also propose ways in which consumption research might be integrated into the largest (in terms of funding) of the population–environment research agendas, land-use and land-cover change research. In the concluding section we present a conceptual framework for understanding the population–environment literature that incorporates production and consumption into the model, and we propose some population–consumption–environment (PCE) research areas to which the population-environment research community could make significant contributions.     

Environmental Refugees? Classifying Human Migrations Caused by Environmental Change

What distinguishes environmental refugees from other refugees—or other migrants? Are all environmental refugees alike? This essay develops a classification to begin to answer these questions and facilitate future policies and research on environmental refugees. Environmental refugees may have considerable control over the decision to migrate, but this varies by the type of environmental disruption. The origin, intention, and duration of environmental disruptions shape the type of refugee. Refugees from disasters and expropriations have limited control over whether environmental changes will produce migration. Gradual degradation allows “environmental emigrants” to determine how they will respond to environmental change.     

Habitat stability and the larval mosquito community in treeholes and other containers on a temperate Island

The temporal fluctuation of water levels and the presence of mosquito larvae were investigated for four types of small container habitats (treeholes, bamboo stumps, cemetery stone vases, and cemetery stone vessels) on Kabeshima Island in Kyushu, southwestern Japan. The probability that containers held water was positively correlated with the quantity of the preceding rainfall and with the depth and volume of the containers. It was estimated that dehydration occurred more regularly in autumn and winter than in summer. The probability that mosquito larvae were present in each type of container was positively correlated with habitat stability in terms of the probability of the existence of standing water and the coefficient of variation of the water level. Twelve species of mosquito larvae, including two rare predators, were found. Species composition differed between the different types of container. Although 4 to 10 species used each type of container, the median number of species per container was two for treeholes and bamboo stumps, and one for the others. The dominant species wasTripteroides bambusa in treeholes and bamboo stumps,Aedes albopictus in stone vases, andA. japonicus in stone vessels. The larval mosquito community, which lacked major predators, possessed the following features that may facilitate the coexistence of many species: (1) niche segregation amongst species in terms of their selection of container types; (2) an aggregated distribution of the individual species among containers of the same type; (3) high intraspecific mean crowding (and hence probably intense intraspecific competition) in the dominant species in each type of container; (4) independent species associations within the same type of container; and (5) low interspecific mean crowding (and hence probablynot intense interspecific competition) between species in the same type of container.     

我国人口分布、迁移的生态环境因素分析

人口分布、迁移受环境、历史、经济等多因素影响,但从经济因素分析人口问题,所占比例较大。本文着重分析区域生态环境与人口分布、迁移的相互影响的关系,并认为:为协调我国人口分布、迁移与区域生态环境之间的关系,关键有两点新思路,一是允许人口分布数量的不均衡存在,二是重视人口迁移的高质量转变。     

Two Population-Environment Regimes in the Great Plains of the United States, 1930–1990

This paper analyzes factors that affect net migration rates in counties in the U.S. Great Plains between 1930 and 1990, emphasizing the roles of weather (especially drought), environmental amenities, employment, and population, making use of a rich county-level data set. Using a pooled time series model the paper shows that environment is important in population processes, with weather and agricultural change more important in the 1930s and 1940s, and environmental amenities more important in later time periods. The paper provides important insights into how environmental impacts on migration might change over time, and how those changes might be measured.     

青海民族地区人口与经济协调发展的几点思考

人口与自然是否相适应,直接影响人口与经济环境的发展。人口与环境不协调发展已成为当前制约青海全面推进小康进程的瓶颈。只有制定出符合青海民族地区实际的计生政策,才可能有效地、整体地推动青海民族地区的经济发展。     

Dynamics of age- and size-structured populations in fluctuating environments: Applications of stochastic matrix models to natural populations

Recent developments of the theory of stochastic matrix modeling have made it possible to estimate general properties of age- and size-structured populations in fluctuating environments. However, applications of the theory to natural populations are still few. The empirical studies which have used stochastic matrix models are reviewed here to examine whether predictions made by the theory can be generally found in wild populations. The organisms studied include terrestrial grasses and herbs, a seaweed, a fish, a reptile, a deer and some marine invertebrates. In all the studies, the stochastic population growth rate (ln λ _s ) was no greater than the deterministic population growth rate determined using average vital rates, suggesting that the model based only on average vital rates may overestimate growth rates of populations in fluctuating environments. Factors affecting ln λ _s include the magnitude of variation in vital rates, probability distribution of random environments, fluctuation in different types of vital rates, covariances between vital rates, and autocorrelation between successive environments. However, comprehensive rules were hardly found through the comparisons of the empirical studies. Based on shortcomings of previous studies, I address some important subjects which should be examined in future studies.     

池田大作环境正义观

从正义的视角来审视当今世界的环境问题是当代环境伦理学的新进展。池田的环境正义观认为,必须从世界范围来看待当今世界的环境危机,应当为提高发展中国家的幸福作出贡献;要把消除全球贫困与拯救世界环境危机联系起来解决;要充分发挥妇女的独特作用,提升女性的地位,绝对是解决地球环境问题的关键;要把享用环境作为一种新的人权来看待,从生命尊严的高度来审视环境问题。     

The early home environment and developmental outcomes for young children in the child welfare system

The quality of the early home environment is predictive of young children's subsequent cognitive, academic, and behavioral functioning. Limited research has focused on the effects of the early caregiving environment on the functioning of young children involved with the child welfare system. This study investigated the influence of children's home environments (i.e., number of children in the home, number of moves the child experienced, level of cognitive stimulation, and level of emotional support) during the first 2 years of life on their preschool developmental outcomes (i.e., cognition, language, social skills, and behavior problems).As anticipated, a high-quality early home environment promoted the well-being of preschool children who had entered the child welfare system as infants. Children who lived with greater numbers of children incurred more compromised cognitive, language, behavioral, and social outcomes. No significant associations emerged between the total number of placements and developmental outcomes; children who remained in the same home during infancy (typically the birth family home) had more compromised developmental outcomes in every domain except behavioral problems.Both cognitive stimulation and emotional support in the home predicted higher cognitive and language scores, decreased behavioral problems, and increased social skills. Early out-of-home placement and lack of emotional support interacted to predict children's behavioral problems. These findings are considered in the context of extant research and policy relevant to young children in the child welfare system.