The past few decades have seen a massive increase in coastal eutrophication globally,
leading to widespread hypoxia and anoxia, habitat degradation, alteration of food-web …

Conservation organizations have most often focused on land‐use change, climate change,
and invasive species as prime threats to biodiversity conservation. Although air pollution is …

Human production of food and energy is the dominant continental process that breaks the
triple bond in molecular nitrogen (N2) and creates reactive nitrogen (Nr) species. Circulation …

Nitrogen emissions to the at-mosphere due to human activity remain elevated in in-
dustrialized regions of the world and are accelerating in many develo** regions (Galloway …

The terrestrial biosphere sequesters up to a third of annual anthropogenic carbon dioxide
emissions, offsetting a substantial portion of greenhouse gas forcing of the climate system …

Some natural ecosystems near industrialized and agricultural areas receive atmospheric
nitrogen inputs that are an order of magnitude greater than those presumed for preindustrial …

Summary 1 Ratios of nitrogen to phosphorus (N: P) in plant foliage have been used to
assess nutrient limitation in wetland ecosystems and to indicate nitrogen saturation …

Human activities have greatly altered the nitrogen (N) cycle, accelerating the rate of N
fixation in landscapes and delivery of N to water bodies. To examine relationships between …

Human activity in the last century has led to a significant increase in nitrogen (N) emissions
and atmospheric deposition. This N deposition has reached a level that has caused or is …

Human land-use activities differ from natural disturbance processes and may elicit novel
biotic responses and disrupt existing biotic-environmental relationships. The widespread …