Nevertheless, administration officials say further research is still necessary because scientists cannot say exactly what effects human activity will have on global climate and how dangerous they will be.
This means there is significant potential for conservation action to mitigate the effect human activities have on the amphibian tree of life, Jetz said.
Researchers said the probable cause of the earlier emergence and longer flight periods is the urban heat island effect: human activities make towns and cities warmer than the surrounding countryside.
Edward Davey, the UK's energy and climate change secretary, said: "This isn't just a symbolic milestone, it's yet another piece of clear scientific evidence of the effect human activity is having on our planet.
"One important implication of this is that while we say overall there have been large population declines inside protected areas, we are not able to say that protected areas are having no effect in mitigating the effects of human activities on biodiversity, because the rates of decline could be more extreme outside".
Managers and scientists should consider and try to document a number of human influences on food webs when striving to effectively predict the consequences and mitigate the effects of human activities on ecosystem structure and function.
(e) to encourage and provide advice on research aimed at (1) improving and developing methods for the assessment of the potential effects of human activities on WGWs and (2) developing and monitoring the effectiveness of mitigation measures.
Environmental policy, any measure by a government or corporation or other public or private organization regarding the effects of human activities on the environment, particularly those measures that are designed to prevent or reduce harmful effects of human activities on ecosystems.
It is then important to understand the effects of human activities that fragment standing forest and, as a result, alter the size, the shape, and also the spatial arrangement of habitat.
These multiyear clusters can have dramatic effects on human activities and welfare.
