The GENESIS V2.0 Global Climate model and a regional climate model is used to evaluate present day and elevated greenhouse gas concentrations. Meteorological variables from the last 4 years of the GCM simulation provide initial conditions and boundary conditions at 12 hour intervals to the regional climate model. In this presentation, we evaluate the changes in the surface climate (temperature, soil moisture, precipitation) and large-scale changes in the tropical atmosphere during the growing season (May-September). Particular emphasis is placed on the ability of both models to properly represent the tropical easterly jet, the african easterly jet and easterly waves. Further, the present day simulation are compared to observed long-term means