Introduction Consequences of declines in bumblebee populations Causes of bumblebee declines Reductions in floral resources Loss of nest sites Pesticides Impacts of non-native bees Habitat fragmentation and population structure Why do some bumblebee species remain common? Conserving bumblebees Enhancing bumblebee diversity in farmland The importance of urban areas Conclusions Summary Points Unre...

Incineration ashes may be treated either as a waste to be dumped in landfill, or as a resource that is suitable for re-use. In order to choose the best management scenario, knowledge is needed on the potential environmental impact that may be expected, including not only local, but also regional and global impact. In this study, A life cycle assessment (LCA) based approach was outlined for envi...

after the soviet union fragmentation, the attentions of regional and international countries have turned to this region for oil and gas discovery in the caspian basin. after that, this region enjoys more geopolitical importance increasingly. therefore, the main question is:” what factors can influence the new geopolitics of the caspian basin?” it seems that, some issues such as the lack of a...