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M. S. Suneetha 《Sustainability Science》2010,5(1):79-87
Biodiversity is acknowledged as one of the most important resources that helps to sustain life’s processes. Additionally,
it is also one of the most important sources of livelihood for different kinds of stakeholders at various levels of resource
markets—local, domestic, or international. With globalization and increasing sophistication in the methods of commercial trade
in biological resources, various issues arise related to the sustenance of resources, of ecological balances, and equity in
transactions. All of these are concerns to be addressed to achieve a state of ‘sustainability.’ This paper prescribes to the
definition of ‘sustainability’ as the capacity to maintain a certain process or state for “improving the quality of human
life while living within the carrying capacity of supporting eco-systems” (IUCN/UNEP/WWF, in Caring for the Earth: a strategy
for sustainable living. Gland, Switzerland, 1991). This goes beyond ensuring inter- and intragenerational equity in access
to resources and includes several other parameters, including equity among stakeholders to returns from biological resources,
related knowledge, trade-offs, and ethical business practices related to these resources. Through the prism of an examination
of a simplistic supply route(s) and value addition chain of biodiversity resources for commercial use, this paper reviews
and highlights issues related to ‘sustainability’ at each stage. Evidence points to shortcomings in the sustainable use of
biological resources at each stage of value addition, calling for focused and specific measures to address them. 相似文献
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The generation of power from the reduction of fossil fuels is the biggest challenge for the next half century. The idea of converting solar energy into electrical energy using photovoltaic panels holds its place in the front row compared to other renewable sources. But the continuous change in the relative angle of the sun with reference to the earth reduces the watts delivered by solar panel. In this context solar tracking system is the best alternative to increase the efficiency of the photovoltaic panel. Solar trackers move the payload towards the sun throughout the day. In this paper different types of tracking systems are reviewed and their pros and cons are discussed in detail. The results presented in this review confirm that the azimuth and altitude dual axis tracking system is more efficient compared to other tracking systems. However in cost and flexibility point of view single axis tracking system is more feasible than dual axis tracking system. 相似文献
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