Plantsare providedwith increasedribulose-1,5-bisphosphate (RuBP) regeneration capacity during the Calvin cyclethrough increased expression of seduheptulose 1,7 biosphosphatase, in combination with reduced photo-respiratory losses through expression of glycolate catabolizing enzymes. Such plants have a greater growth rate and/ or improved biomass and/ or increased carbon fixation compared to untreated plants, or plants comprising only one of the features above.