全文获取类型
收费全文 | 422篇 |
免费 | 38篇 |
国内免费 | 7篇 |
专业分类
安全科学 | 13篇 |
废物处理 | 9篇 |
环保管理 | 99篇 |
综合类 | 131篇 |
基础理论 | 111篇 |
环境理论 | 3篇 |
污染及防治 | 15篇 |
评价与监测 | 9篇 |
社会与环境 | 74篇 |
灾害及防治 | 3篇 |
出版年
2024年 | 1篇 |
2023年 | 11篇 |
2022年 | 14篇 |
2021年 | 16篇 |
2020年 | 14篇 |
2019年 | 12篇 |
2018年 | 14篇 |
2017年 | 18篇 |
2016年 | 21篇 |
2015年 | 13篇 |
2014年 | 18篇 |
2013年 | 32篇 |
2012年 | 20篇 |
2011年 | 34篇 |
2010年 | 16篇 |
2009年 | 23篇 |
2008年 | 13篇 |
2007年 | 14篇 |
2006年 | 17篇 |
2005年 | 21篇 |
2004年 | 22篇 |
2003年 | 23篇 |
2002年 | 11篇 |
2001年 | 16篇 |
2000年 | 16篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 7篇 |
1996年 | 1篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1991年 | 1篇 |
1985年 | 3篇 |
1982年 | 3篇 |
1979年 | 1篇 |
排序方式: 共有467条查询结果,搜索用时 15 毫秒
301.
“绿色贸易堡垒”是国际贸易中非关税贸易堡垒重要的组成部分,它从保护环境的目的出发,在国际贸易中发挥着越来越重要的作用。文章通过对天津市现实状况的研究,提出克服绿色贸易堡垒,为天津市经济在入世后获得“绿色通行证”的对策建议。 相似文献
302.
冯晓宇 《中国环境管理干部学院学报》2013,(3):84-87
以中国环境管理干部学院为例,国际服务外包课程是在国际服务贸易和服务外包产业迅速发展的背景下设置的。通过对我国服务外包行业发展现状和人才需求特点的分析,对国际服务外包课程设置提出系统性、开放性、职业性、实践性的构想,以及调整专业结构、建立灵活人才培养模式、加强学生实习实训、利用现有资源和政策支持以及做好服务外包人才就业工作的相关措施,以确保高职院校国际服务外包课程设计的科学性与可行性。 相似文献
303.
Species composition of the international shark fin trade assessed through a retail‐market survey in Hong Kong 下载免费PDF全文
Andrew T. Fields Gunter A. Fischer Stanley K. H. Shea Huarong Zhang Debra L. Abercrombie Kevin A. Feldheim Elizabeth A. Babcock Demian D. Chapman 《Conservation biology》2018,32(2):376-389
The shark fin trade is a major driver of shark exploitation in fisheries all over the world, most of which are not managed on a species‐specific basis. Species‐specific trade information highlights taxa of particular concern and can be used to assess the efficacy of management measures and anticipate emerging threats. The species composition of the Hong Kong Special Administrative Region of China, one of the world's largest fin trading hubs, was partially assessed in 1999–2001. We randomly selected and genetically identified fin trimmings (n = 4800), produced during fin processing, from the retail market of Hong Kong in 2014–2015 to assess contemporary species composition of the fin trade. We used nonparametric species estimators to determine that at least 76 species of sharks, batoids, and chimaeras supplied the fin trade and a Bayesian model to determine their relative proportion in the market. The diversity of traded species suggests species substitution could mask depletion of vulnerable species; one‐third of identified species are threatened with extinction. The Bayesian model suggested that 8 species each comprised >1% of the fin trimmings (34.1–64.2% for blue [Prionace glauca], 0.2–1.2% for bull [Carcharhinus leucas] and shortfin mako [Isurus oxyrinchus]); thus, trade was skewed to a few globally distributed species. Several other coastal sharks, batoids, and chimaeras are in the trade but poorly managed. Fewer than 10 of the species we modeled have sustainably managed fisheries anywhere in their range, and the most common species in trade, the blue shark, was not among them. Our study and approach serve as a baseline to track changes in composition of species in the fin trade over time to better understand patterns of exploitation and assess the effects of emerging management actions for these animals. 相似文献
304.
The unsustainable trade in wildlife is a key threat to Earth's biodiversity. Efforts to mitigate this threat have traditionally focused on regulation and enforcement, and there is a growing interest in campaigns to reduce consumer demand for wildlife products. We aimed to characterize these behavior-change campaigns and the evidence of their impacts. We searched peer-reviewed and grey literature repositories and over 200 institutional websites to retrieve information on demand-reduction campaigns. We found 236 campaigns, mainly in the grey literature. Since the 1970s, the number of campaigns increased, although for over 15% a start date could not be found. Asia was the primary focus, although at the national level the United States was where most campaigns took place. Campaigns most often focused on a single species of mammal; other vertebrates groups, with the exception of sharks, received limited attention. Many campaigns focused on broad themes, such as the wildlife trade in general or seafood. Thirty-seven percent of campaigns reported some information on their inputs, 98% on strategies, 70% on outputs, 37% on outcomes (i.e., changes in the target audience), and 9% on impacts (i.e., biological changes or threat reduction). Information on outcomes and impacts was largely anecdotal or based on research designs that are at a high risk of bias, such as pre- and postcampaign comparisons. It was unclear whether demand-reduction campaigns had direct behavioral or biological impacts. The lack of robust impact evaluation made it difficult to draw insights to inform future efforts, a crucial part of effectively addressing complex issues, such as the wildlife trade. If demand-reduction campaigns are to become a cornerstone of the efforts to mitigate the unsustainable trade in wildlife, conservationists need to adopt more rigorous impact evaluation and a more collaborative approach that fosters the sharing of data and insights. 相似文献
305.
关于贸易与环境关系的几点认识及其对我国的启示 总被引:10,自引:0,他引:10
环境与贸易是环境与发展的热点问题之一。环境与贸易的主要关系问题包括贸易活动本身与环境的关系问题 ,以及贸易规则与环境的关系问题。环境成本外部化是这些问题的根源。我国在新形势下针对这些问题应当采取相应的对策措施。 相似文献
306.
China and the European Union (EU) signed the first international circular economy (CE) agreement shortly after China issued the ‘Waste Ban’ (WB) on the import of 24 categories of solid waste. While the WB gained global attention, limited research addresses its political implications for international CE. Based on 72 expert interviews, 52 documents and participant observation, we study political WB narratives and corresponding perceptions of ‘Chinese’ and ‘European’ agency in the China-EU case. Our results show a political gridlock in China-EU CE coordination: the main narratives on the WB diverge on the very roles and rules of CE cooperation, scales of implementation, and the assessment criteria for environmentally and socially sustainable CE(s). To enable fruitful CE cooperation, we suggest three critical points for reflection and negotiation: (1) overcome ‘student–teacher’ roles rooted in linear development that run counter to CE ideas; (2) reconsider the focus on international and national waste diversion, instead of local waste prevention, that propels global waste markets sustained by increasing waste volumes; and (3) evaluate both the benefits and impediments of (new) trade relations for a CE cooperation that contributes to environmental and social sustainability.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-022-01758-4. 相似文献
307.
用食物供给量与生产量分别表示食物的可及性与自给率,其差值可表示食物贸易量,以人均每天卡路里为单位进行的折算可以更好地反映膳食营养的变化。从食物贸易视角分析了28年来食物供需平衡状况,结果表明:(1)1986—2013年,全球食物贸易量增加1.5倍;食物总产量增加0.75倍,贸易量在总产量中的比例增加约8个百分点,相当于7.9×108t食物进入国际市场,这成为改善膳食结构的重要因素。(2)28年来,食物可及性与自给率呈上升趋势,全球绝大部分人口已经达到最低2200 kal的营养标准。(3)食物可及性、自给率、贸易量均存在地域差异,非洲及南亚的部分国家是低值地区。(4)总体来看,全球人均每天热量与蛋白质供给量增加。低收入国家增速最快,中等收入国家增速次之,高收入国家增速最慢。但非洲、东南亚等地的一些欠发达国家仍未达到最低的营养标准,全球仍有一部分人处于营养不良状态。 相似文献
308.
309.
310.
基于LMDI方法的中国国际贸易隐含碳分解 总被引:4,自引:0,他引:4
对国际贸易产生环境影响的定量研究正日益受到关注,特别是对隐含碳的研究.以中国2005年为例,对中国国际贸易隐含碳进行估算,应用对数平均D氏指数法(LMDI)对影响隐含碳净转移的因素进行分解分析.结果显示中国因生产排放碳量远大于其消费需要排放的碳量,从国外净转移到中国的隐含碳为395.66MtC;净转移隐含碳影响因素中强度效应(进出口商品完全碳排放系数差异)贡献率为60%,规模效应(进出额差异)贡献率为55%,结构效应(进出口结构差异)贡献率为-14%,此结果表明中国相比国外的高碳排放强度是造成目前碳转移额外增加的主要因素,分析结构效应发现中国主要净出口行业大部分不是高碳排放强度行业,而净进口行业却主要由高碳排放强度行业构成,特别是与碳排放密切相关的能源行业居净进口行业首位. 相似文献