His integrative, multi-disciplinary and collaborative research and teaching is on the response of arable crops, energy crops and complex gro-ecosystems to their environment with an emphasis on climate change and ecosystem services.
He has published over 90 papers in reviewed journals and has received four international prizes for research and teaching.
In 2007, he was one of the scientists honoured by the Nobel Peace Prize for his work with the Intergovernmental Panel on Climate Change since 1995.