Roger Payne Livres

Sustainability has become an important concern for environmentalists, agricultural researchers, farmers, politicians and ordinary voters. All agree on the importance of ensuring that agricultural systems of production can, in some sense, be sustained, i.e. be operated in such a way that quality of output can be maintained year after year, without degradation of the environment. There is less agreement, however, on how this concept of sustainability should be interpreted, or precisely defined, let alone measured. It was against this background of lack of precision in defining the sustainability concept that the Rockefeller Foundation commissioned an international research study on sustainability to exploit the wealth of potential information in established long-term experiments. Six major centres of long-term experiments were invited to conduct detailed studies of their data and to address the issue of definition and, in particular, to make proposals on how to measure sustainability in quantitative terms. The book is divided into three The book has been structured as a comprehensive and unified contribution to this important issue and will be a valuable resource for researchers, professionals and policy makers interested in sustainability.

Après la guerre de Troie, Ulysse ne retournera pas de sitôt à Ithaque. Héros malmené par les dieux, il erre pendant dix ans de naufrages en catastrophes, jouet de forces qui le dépassent. Il devient ainsi le premier aventurier à explorer les confins du monde pour en rapporter un fabuleux récit. Considérée comme l'un des plus beaux poèmes de l'humanité, l'Odyssée fait partie de ces ouvrages qui ont laissé une empreinte profonde dans la culture occidentale. si bien qu'on peut affirmer, avec Pierre Bergounioux, que "le monde n'est plus le même après qu'on a lu l'Odyssée".