全文获取类型
收费全文 | 4849篇 |
免费 | 149篇 |
国内免费 | 110篇 |
专业分类
安全科学 | 178篇 |
废物处理 | 42篇 |
环保管理 | 1298篇 |
综合类 | 1969篇 |
基础理论 | 357篇 |
环境理论 | 19篇 |
污染及防治 | 321篇 |
评价与监测 | 645篇 |
社会与环境 | 244篇 |
灾害及防治 | 35篇 |
出版年
2023年 | 27篇 |
2022年 | 38篇 |
2021年 | 57篇 |
2020年 | 165篇 |
2019年 | 73篇 |
2018年 | 65篇 |
2017年 | 123篇 |
2016年 | 157篇 |
2015年 | 113篇 |
2014年 | 182篇 |
2013年 | 241篇 |
2012年 | 174篇 |
2011年 | 326篇 |
2010年 | 167篇 |
2009年 | 297篇 |
2008年 | 234篇 |
2007年 | 246篇 |
2006年 | 234篇 |
2005年 | 128篇 |
2004年 | 151篇 |
2003年 | 207篇 |
2002年 | 192篇 |
2001年 | 182篇 |
2000年 | 212篇 |
1999年 | 187篇 |
1998年 | 161篇 |
1997年 | 155篇 |
1996年 | 96篇 |
1995年 | 66篇 |
1994年 | 86篇 |
1993年 | 85篇 |
1992年 | 51篇 |
1991年 | 34篇 |
1990年 | 20篇 |
1989年 | 20篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 17篇 |
1985年 | 16篇 |
1984年 | 18篇 |
1983年 | 8篇 |
1982年 | 10篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 4篇 |
1978年 | 13篇 |
1977年 | 8篇 |
1976年 | 4篇 |
1972年 | 2篇 |
1971年 | 5篇 |
排序方式: 共有5108条查询结果,搜索用时 135 毫秒
181.
整体环境教育体系与实施 总被引:2,自引:0,他引:2
由环境问题的长期性、复杂性和整体性,提出建立一个全方位、多层次、适合社会各阶层的整体环境教育体系,并论述了整体环境教育的体系和模式,以及实施内容。 相似文献
182.
183.
水环境质量标准的发展探讨 总被引:3,自引:0,他引:3
从国家水环境质量标准的修改和测试项目的增减出发,阐述了我国水环境质量标准发展的历史和现状,以及可能产生的影响,分析了国内外水环境质量标准的差异,并提出相关建议。 相似文献
184.
185.
总结了闵行区在创建环保模范城区工作中的主要做法,并以具体数据比较了创模前后该区的环境效益、经济效益及社会效益。结果表明,通过创模,全区的污染物排放总量得到了很大削减,环境质量有明显提高,投资环境有进一步改善。 相似文献
186.
随着人类环境意识的觉醒与升华,引发了对自身生存环境的更深层次的思考。本文就环境承载力的内涵与外延以及它既会造成贫困又可解脱贫困的关键作用进行了研究和探讨。 相似文献
187.
188.
William G. Coleman 《Environmental management》1996,20(6):815-825
The term biodiversity describes the array of interacting, genetically distinct populations and species in a region, the communities they comprise, and the variety of ecosystems of which they are functioning parts. Ecosystem health, a closely related concept, is described in terms of a process identifying biological indicators, end points, and values. The decline of populations or species, an accelerating trend worldwide, can lead to simplification of ecosystem processes, thus threatening the stability and sustainability of ecosystem services directly relevant to human welfare in the chain of economic and ecological relationships. The challenge of addressing issues of such enormous scope and complexity has highlighted the limitations of ecology-as-science. Additionally, biosphere-scale conflicts seem to lie beyond the scope of conventional economics, leading to differences of opinion about the commodity value of biodiversity and of the services that intact ecosystems provide. In the face of these uncertainties, many scientists and economists have adopted principles that clearly assign burdens of proof to those who would promote the loss of biodiversity and that also establish near-trump (preeminent) status for ecological integrity. Electric utility facilities and operations impact biodiversity whenever construction, operation, or maintenance of generation, delivery, and support facilities alters landscapes and habitats and thereby impacts species. Although industry is accustomed to dealing with broad environmental concerns (such as global warming or acid rain), the biodiversity issue invokes hemisphere-wide, regional, local, and site-specific concerns all at the same time. Industry can proactively address these issues of scope and scale in two main ways: first, by aligning strategically with the broad research agenda put forth by informed scientists and institutions; and second, by supporting focused management processes whose results will contribute incrementally to the broader agenda of rebuilding or maintaining biodiversity. 相似文献
189.
Economists have tried to estimate the demand for recreation under conditions of congestion, struggling especially with a model that uses observed rather than stated behaviour to obtain results. This paper reports statistical analyses of data on perceptions, mitigating behaviour and management preferences in order to highlight the difficulties related to empirical analysis of congestion. We offer evidence that may be of assistance to those wishing to construct measures of congestion for use in an observed behaviour model. The results may also be useful to recreation area managers who can implement a quota or permit system or change site entry or access fees to control access to the site they manage. 相似文献
190.
This paper provides non-hazardous solid waste audit procedures and bench mark audit data for golf courses (GCs). The paper also demonstrates the narrow scope of solid waste audit data, and the need to move towards a broader auditing scope such as that contained in sustainability auditing frameworks. A case study of Clear Lake Golf Course, located in southwestern Manitoba, Canada was completed. Annual waste generation rates at the GC were estimated to be 46.2 tonnes/year with 83% of this material compostable. Grass clipping material generated from the putting greens accounted for 79% of the waste stream. The GC achieved a solid waste diversion rate of 81% (waste generated not destined for landfill per total waste material generated). A future, realistic target of 97% diversion was also identified. The 7 day audit period was found to be unsuitable for estimating grass clipping generation rates. Implementation of a broader sustainability framework for future audits will harmonize many existing management functions such as solid waste auditing, waste characterizations, pollution prevention, green procurement, customer satisfaction, and the efficiency of the operations. 相似文献