Abstract
Forests play a critical role in mitigating climate change, and, at the same time, are predicted to experience large-scale impacts of climate change that will affect the efficiency of forests in mitigation efforts. Projections of future carbon sequestration potential typically do not account for the changing economic costs of timber and agricultural production and land use change. We integrated a dynamic forward-looking economic optimization model of global land use with results from a dynamic global vegetation model and meta-analysis of climate impacts on crop yields to project future carbon sequestration in forests. We find that the direct impacts of climate change on forests, represented by changes in dieback and forest growth, and indirect effects due to lost crop productivity, together result in a net gain of 17 Gt C in aboveground forest carbon storage from 2000 to 2100. Increases in climate-driven forest growth rates will result in an 81%–99% reduction in costs of reaching a range of global forest carbon stock targets in 2100, while the increases in dieback rates are projected to raise the costs by 57%–132%. When combined, these two direct impacts are expected to reduce the global costs of climate change mitigation in forests by more than 70%. Inclusion of the third, indirect impact of climate change on forests through reduction in crop yields, and the resulting expansion of cropland, raises the costs by 11%–38% and widens the uncertainty range. While we cannot rule out the possibility of climate change increasing mitigation costs, the central outcomes of the simultaneous impacts of climate change on forests and agriculture are 64%–86% reductions in the mitigation costs. Overall, the results suggest that concerns about climate driven dieback in forests should not inhibit the ambitions of policy makers in expanding forest-based climate solutions.
Keywords
climate change, wildfire, forest growth, dynamic global vegetation model, dynamic forward-looking model of land use, forest carbon sequestration, mitigation
Date of this Version
9-20-2022
Recommended Citation
Golub, Alla; Sohngen, Brent; Cai, Yongyang; Kim, John; and Hertel, Thomas, "Costs of Forest Carbon Sequestration in the Presence of Climate Change Impacts" (2022). Department of Agricultural Economics Faculty Publications. Paper 126.
https://docs.lib.purdue.edu/agedocs/126
Included in
Economics Commons, Environmental Studies Commons, Food Security Commons, Food Studies Commons
Comments
This is the publisher PDF of Alla Golub et al, Costs of forest carbon sequestration in the presence of climate change impacts, 2022 Environ. Res. Lett. 17 104011. Published CC-BY by IOP Publishing, the version of record and ADA Title II compliant version is also available in HTML at DOI: 10.1088/1748-9326/ac8ec5.