全文获取类型
收费全文 | 37824篇 |
免费 | 386篇 |
国内免费 | 296篇 |
专业分类
安全科学 | 1081篇 |
废物处理 | 1371篇 |
环保管理 | 5257篇 |
综合类 | 6231篇 |
基础理论 | 10671篇 |
环境理论 | 27篇 |
污染及防治 | 9661篇 |
评价与监测 | 2259篇 |
社会与环境 | 1689篇 |
灾害及防治 | 259篇 |
出版年
2022年 | 254篇 |
2021年 | 253篇 |
2020年 | 216篇 |
2019年 | 285篇 |
2018年 | 514篇 |
2017年 | 487篇 |
2016年 | 719篇 |
2015年 | 626篇 |
2014年 | 863篇 |
2013年 | 2806篇 |
2012年 | 1086篇 |
2011年 | 1603篇 |
2010年 | 1311篇 |
2009年 | 1369篇 |
2008年 | 1610篇 |
2007年 | 1676篇 |
2006年 | 1475篇 |
2005年 | 1282篇 |
2004年 | 1229篇 |
2003年 | 1181篇 |
2002年 | 1156篇 |
2001年 | 1544篇 |
2000年 | 1082篇 |
1999年 | 693篇 |
1998年 | 511篇 |
1997年 | 542篇 |
1996年 | 551篇 |
1995年 | 614篇 |
1994年 | 562篇 |
1993年 | 502篇 |
1992年 | 511篇 |
1991年 | 488篇 |
1990年 | 482篇 |
1989年 | 508篇 |
1988年 | 433篇 |
1987年 | 379篇 |
1986年 | 361篇 |
1985年 | 372篇 |
1984年 | 372篇 |
1983年 | 400篇 |
1982年 | 404篇 |
1981年 | 351篇 |
1980年 | 313篇 |
1979年 | 352篇 |
1978年 | 284篇 |
1977年 | 248篇 |
1976年 | 240篇 |
1975年 | 247篇 |
1973年 | 216篇 |
1972年 | 238篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
J A Heidman 《Journal - Water Pollution Control Federation》1975,47(6):1493-1498
133.
134.
135.
There is a growing recognition that knowledge of indigenous communities, based on accumulated observations and experience over time, is significant for sustainable environmental management in collaboration with modern scientific knowledge. A number of innovative policy initiatives are currently being implemented in New Zealand to enable indigenous Maori tribes and sub-tribes to rehabilitate and manage their local fisheries in accordance with customary values and practices. These policies are an important milestone from an historical perspective as they are meant to recognise and empower the role of Maori as Treaty partners. The fisheries management regime in New Zealand now provides for Maori representation at the local level within a co-management framework that enables local Maori communities to exercise their customary rights. These institutional arrangements have been crafted to facilitate Maori input, based on customary values and practices, to complement modern Western management practices for sustainable harvesting of marine resources. Nevertheless, the degree to which these initiatives constitute an adequate response to Maori Treaty aspirations is debatable. A major constraint in this respect is that the government is compelled to recognise the needs of other, economically and politically more dominant, non-Maori user-groups in allocating and managing access to fishery resources and the marine environment. 相似文献
136.
In the UK for the period 1994-99, a broad range of environmental projects were given financial support through the European Agriculture Guidance and Guarantee Fund under the Objective 1 and Objective 5b programmes. This paper is concerned with the ex-post evaluation of these projects set within a Sustainable Development framework. The aim was to identify project types or characteristics that offered the greatest return on investment. A classification of six broad project types was adopted. The evaluation revealed that there were significant differences between individual projects with respect to the type and scale, and temporal and social distribution of the benefits they delivered. In particular, as well as delivering environmental and economic benefits, many projects made a significant contribution to the development of human and social capital. The paper concludes that it is possible to improve the basis for future project selection in order to maximise the returns on environmental investments in the context of sustainable development. 相似文献
137.
This article does not focus on adaptation or mitigation policy directly but on an allied opportunity that exists for the Pacific
Islands via the auspices of the Climate Convention, because the existing very costly energy systems used in the Pacific Island
region are fossil-fuel dependent. It is argued here that efforts can be made towards the development of energy systems that
are ecologically sustainable because Pacific Island nations are eligible to receive assistance to introduce renewable energy
technology and pursue energy conservation via implementation mechanisms of the Climate Convention and, in particular, through
transfer of technology and via joint implementation.
It is contended that assistance in the form of finance, technology, and human resource development from developed countries
and international organizations would provide sustainable benefits in improving the local Pacific Island environments. It
is also emphasized that mitigation of greenhouse gas emissions is not the responsibility of the Pacific Islands as they contribute
very little on a per capita global scale and a tiny proportion of total global greenhouse gas emissions. 相似文献
138.
B. Rollin 《Journal of Agricultural and Environmental Ethics》1997,10(1):25-40
The creation of a cloned sheep from mammary tissue has raisedmajor social concern, and much talk about major ethical issuesoccasioned by this technology. It is necessary to separategenuine from spurious ethical issues here, a task made failureto initiate ethical discussion and explanation of new technologyas well as by fear reactions in society. As in geneticengineering of animals, issues about cloning fall into threecategories – suggestions that the technology is inherently wrong,risk emerging from the technology and harm to the creatureengendered. The issues regarding the cloning of humans can beanalyzed using the same categories. 相似文献
139.
Robert B. Olshansky 《Environmental management》1996,20(1):11-23
The California Environmental Quality Act (CEQA) has evolved from a mini-NEPA, first enacted in 1970, into a procedural act
that affects the approval process of all large developments in California. In 1990, California local governments produced
over 1600 environmental impact reports and 30,000 initial studies under CEQA. Because of its widespread use, CEQA has periodically
drawn the attention of the state legislature, most recently in 1993, when over 60 CEQA reform bills were introduced. This
paper describes the CEQA process and evaluates its success at meeting its explicit and implicit goals. The research includes
a statewide survey of CEQA practice, sent to the planning departments of all 513 local governments in California in 1991.
Survey respondents agreed that CEQA helps in evaluating environmental impacts, reducing impacts, informing the public, and
coordinating public agency review. It is effective in reducing the environmental impacts of individual projects, but is not
as effective in improving environmental quality on an areawide scale. This research concludes that CEQA has led to positive
outcomes and is not as deeply flawed as many of its critics claim. Still, CEQA as currently designed may not be the optimal
vehicle for ensuring environmental quality. 相似文献
140.