FLUXPYR (www. uxpyr.eu) is a research network for the determination and management of water, carbon and energy uxes in agricultural and grassland ecosystems in the Pyrenees in a context of climate and land use changes. It involves more than 50 multidisciplinary researchers from Spain, France and Andorra and is based on three related components: research, transfer and training. It combines ux measurement and remote sensing techniques as well as modelling to study ecosystem patterns and processes on di erent scales and to disentangle the e ects of weather, climate and land use changes on Pyrenean ecosystems and landscapes. It contributes to the development of innovative technologies and protocols, and to the elaboration of meteorological models and predictive maps of land cover, water content and carbon distribution and snow cover. It links science and policy by informing policy makers and stakeholders and helps with the establishment of guidelines for the sustainable management of grasslands and other agroecosystems and the development of suitable mitigation and adaptation strategies. FLUXPYR also raises awareness among citizens on the causes and consequences of global changes, and ways to cope with them. e success and future of FLUXPYR will depend on its capacity to generate high quality scienti c products, to translate those products into useful tools for society and the management of the environment, and to connect itself to other networks and actors which are already working on climate change issues in Europe.