Deutsche Welle: Nitrogen is essential to plant life and makes up more than three quarters of the Earth’s atmosphere – but there can be too much of a good thing. A rise in fossil fuel-burning and an increase in nitrogen-producing industrial and agricultural activities are leading to excess levels of the element in the environment, according to a study just published in the journal Science. Researchers Donald Canfield, Alex Glazer and Paul Falkowski – of the University of Southern Denmark, the …