Considers the role of fertiliser use in agriculture as a major contributor to the imbalance of the global nitrogen cycleReviews the effectiveness of inorganic nitrogen fertilisers and organic sources of nitrogen in optimising nitrogen use efficiencyHighlights recent developments in the use of enhanced efficiency nitrogen fertilisers to reduce nitrous oxide emissions

Find a fulfilling career that tackles the world's most pressing problems, using this guide based on over ten years of research alongside academics at Oxford.You have about 80,000 hours in your career: 40 hours a week, 50 weeks a year, for 40 years. This means your choice of career is one of the most important decisions you’ll ever make.Make the right choices, and you can help solve some of the world’s most pressing problems, as well as have a more rewarding, interesting life....

" Un récit bouleversant sur le combat des femmes pour l'égalité et l'indépendance. " The New York Times Book Review.Dans la grande tradition du roman sudiste, La Couleur pourpre, qui dénonce l'oppression raciale et sexuelle dont furent victimes les femmes noires, a fait date. Celie et Nettie sont deux soeurs séparées à l'adolescence mais liées par un amour indéfectible que ne terniront ni les brimades ni le mépris, ni les guerres ni l'absence. Cel...