The ecological-economic model will combine the output from the ecological models and the agri-economic cost assessment. As a first step, the costs and benefits of the policy instruments of biodiversity conservation (incentive payments for nature conservation measures, offsets and land purchase for conservation) are simulated. In a second step the results are optimized.  For the optimization, we consider two options: (1) maximize species survival under climate change for given budgets (2) minimize budget under the constraint of species survival under climate change.