"anthropogenic sources" refers to things that are caused or created by humans. It is used to describe the sources or origins of something that is a result of human activities or actions. Full definition
Moreover, there is no direct evidence, no smoking gun, which points to anthropogenic sources as the reason behind global warming. (realclimate.org)
It is likely that the influence of European anthropogenic sources is diluted at northern latitudes, but the signal is still evident. (pnas.org)
Addressing the challenges posed by climate change will require a combination of adaptation to the changes that are likely to occur and global reductions of CO2 emissions from anthropogenic sources. (dotearth.blogs.nytimes.com)