Benefits and trade-offs of optimizing global land use for food, water, and carbon
Current large-scale patterns of land use reflect history, local traditions, and production costs, much more so than they reflect biophysical potential or global supply and demand for food and freshwater, or—more recently—climate change mitigation. We quantified alternative land-use allocations that...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
October 9, 2023
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| In: |
Proceedings of the National Academy of Sciences of the United States of America
Year: 2023, Jahrgang: 120, Heft: 42, Pages: 1-8 |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.2220371120 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1073/pnas.2220371120 Verlag, kostenfrei, Volltext: https://www.pnas.org/doi/10.1073/pnas.2220371120 
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| Verfasserangaben: | Anita D. Bayer, Sven Lautenbach, and Almut Arneth |
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| 245 | 1 | 0 | |a Benefits and trade-offs of optimizing global land use for food, water, and carbon |c Anita D. Bayer, Sven Lautenbach, and Almut Arneth |
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| 520 | |a Current large-scale patterns of land use reflect history, local traditions, and production costs, much more so than they reflect biophysical potential or global supply and demand for food and freshwater, or—more recently—climate change mitigation. We quantified alternative land-use allocations that consider trade-offs for these demands by combining a dynamic vegetation model and an optimization algorithm to determine Pareto-optimal land-use allocations under changing climate conditions in 2090-2099 and alternatively in 2033-2042. These form the outer bounds of the option space for global land-use transformation. Results show a potential to increase all three indicators (+83% in crop production, +8% in available runoff, and +3% in carbon storage globally) compared to the current land-use configuration, with clear land-use priority areas: Tropical and boreal forests were preserved, crops were produced in temperate regions, and pastures were preferentially allocated in semiarid grasslands and savannas. Transformations toward optimal land-use patterns would imply extensive reconfigurations and changes in land management, but the required annual land-use changes were nevertheless of similar magnitude as those suggested by established land-use change scenarios. The optimization results clearly show that large benefits could be achieved when land use is reconsidered under a “global supply” perspective with a regional focus that differs across the world’s regions in order to achieve the supply of key ecosystem services under the emerging global pressures. | ||
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