1.C-N-P cycles in agro-ecosystems and impacts on environment 2.Increasing diversity within agro-ecosystem for reducing environmental emissions 3.Heterogeneity within and among agro-ecosystems and dynamics of biodiversity 4.Diversified agro-ecosystem at farm level for more sustainable agriculture production? 5.Socio-economic opportunities for and locking effects against diversification of agro-ecosystems 6.Diversification beyond the farm at landscape and regional level 7.Global aspects