New Kerala: Researchers at the University of Gothenburg revealed that the concentration of nitrogen in plants' tissue is lower in air with high levels of carbon dioxide, regardless of whether or not the plants' growth is stimulated. The study examines various types of ecosystems, including crops, grasslands and forests, and involves large-scale field experiments conducted in eight countries on four continents. Researcher Johan Uddling said that the findings are unequivocal. The nitrogen content in the crops...