European agriculture must progress towards a more multi-faceted utilization of different types of land in order to conserve arable land and thereby food production, The simultaneous production of food, energy and fibres appears economically viable. This also provides a solution to environmental problems of the community. The utilization of waste products as fertilizer when cultivating biomass should be done in such a way that we remain able to return rapidly to full-scale food production if unexpected developments occur. Thus crops chose must be able to be replaced rapidly by grain or pasture on land which has not experienced a loss of fertility or pollution by heavy metals.