A map-based tool is developed to integrate climate change mitigation into WFD action programmes.
Synergies between nitrogen and GHG emission reductions for agriculture are assessed.
Agri-environmental measures can reduce both nutrient losses and GHG emissions cost-effectively.
We find a very significant potential for synergistic WFD action programmes for the case study catchment.
A differentiated approach tailored to the river basin is key to successful integration of climate change mitigation.