Has the bell tolled for the North American mineral and metal industry?

The author examines the reasons behind the current state of the North American metal mining industry. Taking demand-side factors first, he explains the dramatic fall in metals consumption. External shocks are seen to have affected the previously well rationalized structure of supply in the 1960s, bringing about an increase in production costs and limiting capacity for industrial rationalization. At the beginning of the 1980s, the situation is seen to have been exacerbated by a larger number of producers, more supply sources and an increase in costs. During the course of the decade, the author relates how the situation worsened due to the strength of the US dollar and high interest rates.     

WATER DIVERSIONS TO THE NORTH AMERICAN PRAIRIES1

ABSTRACT .The major purpose of existing and proposed diversions of water to the Prairies is for irrigation. Being flat lands adaptable to mechanized agriculture and possessing a good network of rail and highway access, they are well suited for such use. Wheat surpluses, currently a serious problem in Canada, can be expected to melt under world population pressures and conversion of wheat lands to other crops with the advent of irrigation. The water sources envisaged are in the Canadian Arctic watershed with the United States purchasing Canadian water at the boundary. There is an increasing interest in the Canadian Prairie Provinces in regarding water as a commodity and selling some of it to pay for the development required to put the portion retained in Canada to use.     

中美两国环境空气质量标准比较

比较了中美两国环境空气质量标准的制定依据、功能区划分、标准级别、污染物项目、取值时间和污染物质量浓度限值等内容。指出美国环境空气质量标准的修订频次高于我国；污染物控制项目较我国少；标准级别的制定和污染物质量浓度限值总体上较我国宽松。但是，美国环境空气质量标准注重对人体健康影响较大的污染物如PM2.5的控制。     

人才资源向人才资本转变的大市场--中美技术贸易市场

中美两国技术贸易市场开发前景良好,双方具有互补性.只要两国从大局出发,增进交流与合作,它必将是21世纪中美两国的大市场.     

论我国海岸带立法的核心内容

2018年11月18日发布的《中共中央国务院关于建立更加有效的区域协调发展新机制的意见》明确提出了"推动海岸带管理立法"的工作要求。该工作的重心理应是解决目前我国海岸带管理实践中的突出问题，即陆海之间、部门行业之间和行政辖区之间难以统筹协调的问题。解决该问题的有效途径是通过立法的方式构建统筹协调机制。美国海岸带管理制度中的统筹协调机制颇具特色，由"总协调人"和"联络人"制度、"联邦一致性"制度、州海岸带管理项目与州其他项目的统筹协调制度，以及陆海统筹协调制度等方面组成。我国可以借鉴其成功经验，在海岸带立法中，以构建统筹协调机制为核心内容。该机制以程序性规则为主体，设立"总协调人"和"联络人"制度，组成统筹协调网络，并规定统筹协调的基本"排序规则"。     

Need for sustainable development awareness management in Cuba

The present paper acknowledges the need for sustainable development education in Cuba, after a short review of their national health status and educational system. The environmental situation of the island is outlined, including the role played by environmental education (EE) in the current environment system. The-EE in Cuba is presented, and the problems related to its implementation are analyzed. Recommendations and possible solutions towards the use of education for sustainability as a tool for environmental management are presented, so as to prove the need for environmental awareness management in Cuba.     

Modelling potential habitat for cougars in midwestern North America

Cougars (Puma concolor) are of considerable interest to wildlife biologists and the general public in midwestern North America, yet no researchers have modelled potential habitat in the region. We created a model of potential cougar habitat in 9 midwestern states using geospatial data, expert-opinion surveys, the analytical hierarchy process, and a GIS. About 8% of the study region contained highly favorable habitat (with favorability scores ≥75%) for cougars; the states of Arkansas (19%) and Missouri (16%) contained the highest proportions of potentially favorable habitat. We identified 6 large (≥2500 km² in size), contiguous areas of highly favorable habitat for cougars. Model testing procedures indicated a valid model when compared to an independent set of cougar locations, a null dataset, and similar studies. Our model is useful as a planning tool to proactively address future human-cougar conflicts should cougars re-colonize the Midwest via subadult dispersal.     

美国大气排污许可证制度分析及启示

介绍了美国大气排污许可证制度的类型及适用范围、申领门槛及流程、内容及执行情况,指出美国通过实施预建许可证与运营许可证制度,实现了对新、改建固定污染源及现有固定污染源的全过程监管。结合我国大气排污许可证制度存在的问题,提出了进一步完善法律支撑、加强计量体系建设、加大许可证执行力度等建议。     

中美饮用水水源水质标准比较

对我国《地表水环境质量标准》(GB 3838-2002)和《地下水质量标准》(GB/T 14848-1993)与美国EPA《清洁水法案》和《安全饮用水法案》中适用范围、分类分级、指标项目、标准限值以及修订周期等方面内容进行比较分析。指出了我国饮用水水源水质标准存在的问题,提出构建和修订我国水源地水质标准的建议。     

美日环境保护对我国的启示

通过分析美、日两国环境保护的发展历程与环境保护在完善法律、加强环境教育、积极的政府引导与专门的政府投入等方面的特点,并结合我国实际,指出我国环境保护应在科学立法、完善环境教育体系、加强国际间合作与交流等方面作出努力,以实现经济与环境和谐发展。