Background Net carbon sequestration by terrestrial vegetation is countering the effects of anthropogenic C emissions and tropical deforestation. The deposition of reactive N originating from anthropogenic emissions and intensive agriculture has long been suggested as a key determinant of this sequestration activity, but a lively debate has emerged on the magnitude of such an effect and the mechanisms involved. The topic has important implications, as C-N interactions could determine the response of forest ecosystems to future temperature and atmospheric CO2 changes, as well as the impact of future environmental policies. Aims of the workshop The aim of the workshop is to assess the latest scientific understanding of this issue and highlight remaining uncertainties and open questions, as a starting point for informed policies and future research. Attendance to the workshop will be limited to a small number of scientists and policy-makers, and all presentations will be by invitation only. Experts from different backgrounds will be invited to provide a review of their special field of interest. Attendance to the workshop will also be limited to no more than 50 people, so as to provide a real opportunity for an informed discussion. We hope that the meeting will result in a white paper on the issue, in order to provide a sound scientific basis for future environmental policies.
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