Loss of biodiversity appears to affect ecosystems as much as climate change, pollution and other major forms of environmental stress, according to results of a new study by an international research team. The study is the first comprehensive effort to directly compare the effects of biological diversity loss to the anticipated effects of a host of other human-caused environmental changes. The results, published in this week\'s issue of the journal Nature, highlight the need for stronger local, national and international efforts to protect biodiversity and the benefits it provides, according to the researchers, who are based at nine institutions in the United States, Canada and Sweden. \"This analysis establishes that reduced biodiversity affects ecosystems at levels comparable to those of global warming and air pollution,\" said Henry Gholz, program director in the National Science Foundation\'s Division of Environmental Biology, which funded the research directly and through the National Center for Ecological Analysis and Synthesis. \"Some people have assumed that biodiversity effects are relatively minor compared to other environmental stressors,\" said biologist David Hooper of Western Washington University, the lead author of the paper. \"Our results show that future loss of species has the potential to reduce plant production just as much as global warming and pollution.\" Studies over the last two decades demonstrated that more biologically diverse ecosystems are more productive.