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Nitrogen deposition in rural areas of Catalonia, near the threshold for adverse effects on forests
Nitrogen is an essential element for life. Its natural cycle in the biosphere has been modified by human activity, increasing emissions of nitrogen compounds. This study evaluates the nitrogen...
Fossil horse teeth show climatic change
Researchers from the Institut Català de Paleontologia and Utrecht University have analyzed the tooth enamel of fossil horse teeth dating from 11 to 2 million years ago near Teruel, Daroca and Valencia. Changes in the proportion of light and heavy oxygen isotopes in the teeth suggest...
