全文获取类型
收费全文 | 1035篇 |
免费 | 40篇 |
国内免费 | 21篇 |
专业分类
安全科学 | 33篇 |
废物处理 | 4篇 |
环保管理 | 187篇 |
综合类 | 249篇 |
基础理论 | 178篇 |
环境理论 | 41篇 |
污染及防治 | 127篇 |
评价与监测 | 20篇 |
社会与环境 | 121篇 |
灾害及防治 | 136篇 |
出版年
2023年 | 10篇 |
2022年 | 36篇 |
2021年 | 35篇 |
2020年 | 12篇 |
2019年 | 66篇 |
2018年 | 47篇 |
2017年 | 88篇 |
2016年 | 101篇 |
2015年 | 52篇 |
2014年 | 42篇 |
2013年 | 82篇 |
2012年 | 44篇 |
2011年 | 92篇 |
2010年 | 43篇 |
2009年 | 73篇 |
2008年 | 62篇 |
2007年 | 63篇 |
2006年 | 23篇 |
2005年 | 23篇 |
2004年 | 11篇 |
2003年 | 9篇 |
2002年 | 10篇 |
2001年 | 7篇 |
2000年 | 12篇 |
1999年 | 6篇 |
1998年 | 10篇 |
1997年 | 7篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1096条查询结果,搜索用时 203 毫秒
471.
Ecosystem services provided by the landscapes of regions and cities are critical to human and environmental health, quality of life, environmental justice, biodiversity and climate mitigation and adaptation. In the Pacific Northwest region of the US, a team led by the University of Washington Green Futures Lab is working to identify, conserve and enhance regionally-significant landscapes and to evaluate their contributions as ecosystem or “open space” services. This paper outlines the goals and planning methods of the ongoing Regional Open Space Strategy for Central Puget Sound (ROSS) project, and the frameworks and processes being developed to evaluate ecosystem and open space services in order to inform and influence local and regional governance structures and decisions. 相似文献
472.
473.
Modeling China's semiconductor industry fluorinated compound emissions and drafting a roadmap for climate protection 总被引:1,自引:0,他引:1
Scott C. Bartos Nina Kshetry C. Shepherd Burton 《International Journal of Greenhouse Gas Control》2008,2(4):665
Fluorinated compounds (FC) are high-global warming potential (GWP) greenhouse gases used and emitted during the manufacture of silicon semiconductor devices. Following the U.S. EPA's PFC Emissions Vintage Model (PEVM), uncontrolled FC emissions are modeled as proportional to total manufactured layer area (TMLA) of silicon. FC emissions of World Semiconductor Council (WSC) charter member countries (Europe, Japan, Korea, Taiwan and the United States), which voluntarily committed in 1999 to lower FC emissions by 2010 to 10% of baseline year emissions, are modeled for the period 1995–2020. For this same period, emissions from Chinese manufacturers under alternative emission reduction scenarios are modeled. If Chinese manufacturers were to adopt a baseline year of 2005 and a reduction target of 10% below baseline year emissions to be achieved by 2020, emissions would be 3.4 MMTCO2eq, comparable to the similarly projected controlled emissions of an average WSC charter member country (=16.3/5 MMTCO2eq) in 2020. The relative stringency of the alternative reduction scenarios considered for China vary between 50 and 95% reduction compared to business as usual (BAU). This is comparable to the stringency of the WSC charter members’ goals for which FC emission reduction technologies are currently available. 相似文献
474.
We constructed a model to simulate emissions of CO2 from electricity generation in the US and, using the model, we developed 20-year projections of emissions under various regulatory scenarios. 相似文献
475.
International cooperation and learning may accelerate climate change adaptation and help countries and regions to adapt more effectively and efficiently. Recognizing the importance and opportunities for mutual learning and knowledge transfer, international and supranational organizations, such as the European Commission, have put programmes for international cooperation in place. This paper presents and tests a framework for assessing multi-level learning outcomes of such international cooperation processes and the conditions that produce these outcomes. The framework distinguishes between: (1) group learning by individual process participants; (2) organizational learning by organizations represented in the process; and (3) network and societal learning by actors external to the process. We verify the analytical potential of the framework by comparing learning by six partners in an adaptation-oriented European cooperation project. The project scores rather high on group learning with participants learning from and – to a lesser extent – also with each other. Learning by partner organizations varied and was generally less whereas learning by external actors was very limited. The case study confirms our expectation that learning outcomes are produced by combinations of partner-specific, process-specific and process-external conditions. The presented framework and insights can be used to stimulate learning in and from international cooperation processes. 相似文献
476.
The emergent discourse on social-ecological resilience can be understood as a response to the rapid pace of change and severe challenges facing urban areas. This paper reports on one strand of research being carried out as part of the EU FP7 TURAS project (Transitioning to Urban Resilience and Sustainability) that aims to gain insight into the implications of social-ecological resilience thinking on urban planning practice and policy by presenting a unique, trans-disciplinary perspective that has been developed collaboratively between academic, local government and SME partners. A framework for adaptive co-management and design is introduced as a basis for the operationalisation of urban resilience, highlighting the need to actively solve problems collaboratively by exercising imagination and creativity, and presenting a new and potentially fertile source for innovation. Five experiments exploring urban planning practices relating to the framework are put forward as examples of urban resilience in practice: an online crowd-sourcing application for mapping underused spaces; an interactive timeline tool for identifying drivers of change over time; a guidance and signposting tool to help community projects overcome resource barriers; an epistemic network of citizens that exchanges knowledge and resources relating to underused spaces; and an online portal that provides visibility for community groups or projects, and facilitates horizontal networking. The paper describes each experiment, sets out the aims and theoretical contexts, records any initial findings, and reflects on the potential and limitations. Initial findings are discussed relating to the challenges of crowd-sourcing spatial or historical data, and the resource commitment required for the emerging practices. It is observed that the experiments attempt to address fundamental issues in urban planning practice and policy, and involve established and familiar activities. The paper concludes that the research provides insight into what urban resilience might mean in practice and that each experiment has the potential to make a tangible contribution to the transition to urban resilience and sustainability. 相似文献
477.
This study examines the importance of climate variability when simulating forest succession using a process-based model of stand development. The FORSKA-2V forest gap model, originally developed for forcing with monthly mean climate data, was modified to accept daily weather data. The model's performance was compared using different temporal resolutions of forcing along a bioclimatic transect crossing the boreal region of central Canada, including the aspen-parkland and forest-tundra ecotones. Forcing the model with daily weather data improved the simulation of key attributes of present-day forest along the transect, particularly at the ecotones, compared to forcing with monthly data or long term averages. The results support the hypothesis that climatic variability at daily time-scales is an important determinant of present-day boreal forest composition and productivity. To simulate boreal forest response to climatic change it will be necessary to create climatic scenarios that include plausible projections of future daily scale variability. 相似文献
478.
The Paris Agreement reached during the COP21 in December 2015 represents a timid step towards burden sharing in emission mitigation involving all countries. However, given the heterogeneity of countries and their relative differences in vulnerability to climate change damage and in mitigation costs, compensating schemes are required to reach an effective agreement. This paper investigates the role of the Green Climate Fund (GCF) as a potential compensating measure for both adaptation and mitigation actions under a global climate regime. A dynamic climate-economy computable general equilibrium model (GDynEP) is developed by including both a monetary valuation of climate change damage costs and two alternative methods to determine the allocation of GCF resources among receiving countries and between adaptation and mitigation contributions. Results show that, despite the high costs associated with the implementation of mitigation actions, most developing countries would face even higher costs in case of inaction. Furthermore, the preference of a country for an allocation method is strongly influenced by its characteristics and needs. Consequently, a main policy conclusion is to design country-specific sharing rules for GCF in order to maximize country participation in a global agreement. 相似文献
479.
Previous analyses of the debate on the assisted colonization of species (AC) omit a critical assessment of the rhetorical dimension of the AC debate. To address this gap, we ask: what kinds of arguments are deployed as mean of persuasion and what are the implications of the rhetorical dimension of the AC debate for decision-making on AC? Our methods consist of textual network analysis, which allowed us to generate maps of the arguments in the debate on AC and analyze these maps using standard network analytical measures. The argument maps of the AC debate emphasize different and multi-faceted value judgments. Some of these are couched in technical terms and thus are implicitly evaluative: what is an appropriate level of risk for focal species and recipient communities, how much knowledge/ignorance is sufficient to warrant action or inaction, and what species or ecosystem services are most valuable and should be prioritized in conservation science and management? Other types of arguments, however, are more explicitly evaluative: socio-economic calculations, defending or criticizing conventional principles of conservation policy, and ethical norms and values. While some of the technical aspects of the debate may be resolved by more research, the controversy over AC is unlikely to be resolved by science alone, because the issue is thoroughly enmeshed in rhetoric about who should have control over AC governance. 相似文献
480.
Mirlaine R. Freitas Stella V.B.G. Matias Renato L.G. Macedo Matheus P. Freitas Nelson Venturin 《中国人口.资源与环境(英文版)》2015,13(4):324-331
Brazil is a central place in the international agricultural markets and this fact has been demanding environmentally oriented agricultural practices by Brazilian farmers and professionals involved in the agricultural market chain. A concise and structured questionnaire was applied to obtain the environmental perception of a group of Brazilian farmers in a town of the south Minas Gerais state, using herbicides as the topic for a case study. A highly variable opinion about taking the environment into account when choosing the most appropriate herbicide was found. Anyway, efficacy has been indicated as the most important factor when choosing an herbicide, followed by the environment and price. The outcomes from the questionnaires, i.e. the insufficient conception and importance given to environment when choosing the herbicide, motivated the creation of a teaching-learning model for the nonformal environmental education using the concept of socio-ecological resilience. This routine puts in practice the resilience thinking currently invoked as a major tool to achieve the conservation of the socio-ecological system, as well as it is complimentary to the outcome-oriented optimization for conservation theory. For the case study about farmers and the use of herbicides, we conclude that a complex reasoning and, ultimately, pro-environmental actions can be improved after experiencing the recommended model for environmental education. 相似文献