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Ojciec Piet Penning de Vries urodził się 15 marca 1928 w Leiden w Holandii. 7 września 1949 wstąpił do Towarzystwa Jezusowego, a święcenia kapłańskie przyjął 31 lipca 1960. W czerwcu 1973 został kierownikiem duchowym w Wyższym Seminarium Duchowym w Rolduc w Kerkrade, gdzie spędził większość swojego kapłańskiego życia. Uczył, że naśladowanie Chrystusa oznacza oddanie swojego życia na służbę Bogu i Kościołowi oraz na służbę człowiekowi. Miał w zwyczaju powtarzać, że jego życie to tylko stracone pięć minut. Napisał wiele książek i artykułów,...

Approaches to research on the causes and impacts of soil erosion have changed significantly over recent years. Whereas biophysical research traditionally utilized small, carefully-managed erosion plots, models and methods are now available to study impacts of broad scale management on the hydrology and water quality of catchments and even river basins. Corresponding research tools have been developed for social and economic analysis at the household, farm and community levels. This book reviews the latest developments in such soil erosion studies. These are considered on a matrix of scales,...

The symposium In the next decades, agriculture will have to cope with an ever-increasing demand for food and raw basic materials on the one hand, and with the necessity to use resources without further degrading or exhausting the environment on the other hand, and all this within a dynamic framework of social and economic conditions. Intensification, sustainability, optimizing scarce resources, and climate change are among the key issues. Organized thinking about future farming requires forecasting of consequences of alternative ways to farm and to develop agriculture. The complexity of the...

Agriculture is changing rapidly all over the world. Intensification, diversification, optimizing scarce resources, integrated pest management, sustainability and climate change are key issues for agricultural institutes. The best solutions will be found by integrating disciplines. Organized thinking about future farming requires forecasting of the implications of alternative ways to farm and to develop agriculture. Systems thinking and systems simulation are indispensable tools for such integration and extrapolation. About 150 scientists and senior research leaders from all over the world...