Humans continue to transform the global nitrogen cycle at a record pace, reflecting an increased
combustion of fossil fuels, growing demand for nitrogen in agriculture and industry, and …

Increasing quantities of atmospheric anthropogenic fixed nitrogen entering the open ocean
could account for up to about a third of the ocean's external (nonrecycled) nitrogen supply …

Global nitrogen fixation contributes 413 Tg of reactive nitrogen (N r ) to terrestrial and marine
ecosystems annually of which anthropogenic activities are responsible for half, 210 Tg N. …

… This phenomenon is called the N cascade (Galloway 1998), which we define as the
sequential transfer of Nr through environmental systems and which results in environmental …

In 2002, world leaders committed, through the Convention on Biological Diversity, to achieve
a significant reduction in the rate of biodiversity loss by 2010. We compiled 31 indicators to …

Background Early clinical data from studies of the NVX-CoV2373 vaccine (Novavax), a
recombinant nanoparticle vaccine against severe acute respiratory syndrome coronavirus 2 (…

In the absence of human activities, biotic fixation is the primary source of reactive N, providing
about 90–130 Tg N yr −1 (Tg = 10 12 g) on the continents. Human activities have resulted …

This paper contrasts the natural and anthropogenic controls on the conversion of unreactive
N 2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global …

On 13 October 1908, Fritz Haber filed his patent on the “synthesis of ammonia from its elements”
for which he was later awarded the 1918 Nobel Prize in Chemistry. A hundred years on …

Atmospheric nitrogen (N) deposition is a recognized threat to plant diversity in temperate
and northern parts of Europe and North America. This paper assesses evidence from field …