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Given that land is a limited resource, the possibility of establishing an absolute scale is suggested as normalization in Land Use impact assessments in LCA. The case of Biotic Production Potential and bioenergy is taken to illustrate the existence of a "Land Use Optimal Point". It is hypothesized that the problem of available land for bioenergy production can be solved through linear programming, by finding the perfect compromise between the fossil fuel displacement potential (through e.g. business-as-usual yield maximization) and carbon stock maximization (through e.g. forestry systems or reforestation programs). As a result, high yielding bioenergy crops (e.g. short rotation coppices) that displace carbon intensive energy sources (e.g. coal) may make sense from a land use perspective in a transitioning energy system. On ther other hand, low performing bioenergy crops (e.g. rapeseed) substituting other energy sources may fall beyond the Land Use optimality frontier, meaning that a more efficient way of mitigating Global Warming would be reforestation for latter cases.