A meta-analysis of 123 independent studies is revealing a general positive effect of agroecological interventions on biodiversity. This positive effect is observed for arable cropping, perennial and grassland systems, with also a positive trend for horticulture. Statistically significant effects of agroecological interventions are observed for all functional groups except for micro-decomposers. A total of 63 social movements in Europe provide a clear definition of agroecology. While the principles proposed by the High Level Panel of Experts of the UN is a common reference for scientists, 78% of European social movements rather refer to the Nyéléni declaration or other grassroot agroecology definitions. In our network of 11 IHs, we are successfully sharing and valorizing past, ongoing and future experiences of agroecology in order to increase awareness and knowledge exchanges between local stakeholders. To systematically record this knowledge, we are proposing methodologies (causal analysis, network analysis), defining indicators for success, and formulating action plans through reflexive learning cycles. Finally, on the policy dimension, we have built a database of 235 publications for analysing current CAP performance on biodiversity and support the development of recommendations for CAP post-2027, Green Deal and Biodiversity strategy. We have also analysed the claims and counterclaims around the Nature Restoration Law (NRL), demonstrating based on scientific evidence that its benefits, especially with regards to agricultural lands, outweigh the costs. We argue that NRL could contribute to strengthening the links between nature conservation and agricultural land users, and make European agroecosystems more resilient to climate change.