Analyzing the numerous biogeochemical conversions involved in this global element cycles is one of the most important and most pressing scientific challenges of our times. Humanity is intervening in natural cycles on a global scale through land use and technological processes, without being able yet to foresee the long-term consequences. These interventions affect not only the climatically active trace gases in the atmosphere, but also land utilization and biodiversity.
For example, the use of fossil fuels, forest clearance and agricultural management release carbon dioxide in considerable quantities and could re-establish an atmosphere and a climate comparable to earlier geological ages. Since the beginning of industrialization, alterations in the concentration of the trace gases due to anthropogenic interference have been superimposed on the natural variations of these gases that occur on longer time scales.
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