This analysis is based on new land-use management data from the Horizon Europe LAMASUS project, integrating biophysical crop and grass simulations, biodiversity models, and farm-level cost assessments. Environmental benefits are measured by biodiversity intactness (compared to pristine habitats) and CO₂-equivalent emissions from agricultural areas, including non-CO₂ greenhouse gases such as methane (CH₄) and nitrous oxide (N₂O). While the climate benefits alone would not justify the cost, these measures are highly cost-effective for biodiversity: win-win areas are identified where a €350 per hectare annual production loss results in both a 1-ton CO₂-equivalent reduction and a 1% gain in biodiversity intactness—making this a biodiversity-driven strategy with meaningful climate co-benefits.