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Research performed at the AB-DLO and the Free University was intended to quantify the effects of a doubled CO2 concentration on some key agronomic species and grasslands. A set of physiological and morphological processes was studied and related to above- and below ground cycling of carbon. The research was based on experiments and simulation studies at the level of plant, crop and soil in laboratory facilities and semi-field conditions with controlled CO2 supply. Agricultural crops were grown in "Open Top Chambers" or greenhouses and grasses in transparent tunnels made of Lexan. Soil processes and root respiration were studied in the Wageningen Rhizolab. Photosynthesis and assimilate partitioning were measured...
In a field experiment we attempted to stimulate car users to come to a more selective use of their vehicle by means of providing information and feedback about different negative consequences of their car use. Attitude change was observed but the experimental treatments did not lead to behavioural changes. Attempts to influence car use arouse psychological resistance. Therefore, effects opposite to those intended occurred. We discuss the possible implications of the results for policymaking.