Recent changes in the rural communities of the United States
Analysis of changes between 1960 and 1970 for all 3.000counties of the USA. Interpretation of the results leans to the proposition that both rural and urban communities share the same system of values and desires. Differences in opportunities
to realise these desires through incomes and careers in farming accounts for much migration and changes.
The changing structure of the food processing industry: description, causes, impacts and policy alternatives
Industry description and trends in structure. Concentration in food processing. Increasing diversification, conglomeration and vertical integration. Impacts of changing structure of the industry. Policies regarding structure of the industry. (INRA).
Climatic change in the Southern Great Lakes. Eastern Corn Belt areas
l'ensoleillement simultanément à l'augmentation des précipitations et de la nébulosité a caractérisé le changement du climat estival depuis les années 30.
Cette étude quantifie les changements d'importance des paramètres écologiques associés au développement d'une agriculture intensive dans le Wisconsin (20paramètres édaphiques, 31paramètres concernant la couverture végétale). Ces changements ont été