February 08, 2010
Conducting a spatially-explicit analysis of potential land-use change from biofuel feedstock expansion in Brazil, David M. Lapola of the University of Kassel (Germany) and colleagues find that while relatively little forest land will be directly converted for biofuel production, large swathes of rainforest and cerrado will be indirectly impacted through displacement of cattle ranching, presently the dominant form of land use in the Brazilian Amazon.
Soy in Mato Grosso state, Brazil.
A carbon payback time of four years would be needed to compensate for direct emissions from conversion for cane relative to emissions from fossil fuels. The payback for soy biodiesel would be 35 years, according to the research.
But factoring in indirect land use — cattle ranching displaced to forest lands by cropland expansion — dramatically extends the amount of time needed for emissions savings from biofuel production (relative to fossil fuel use) to compensate for emissions from deforestation: by 40 years for cane ethanol and 211 years for soy biodiesel.
Modeled direct (A) and indirect (B) LUC caused by the fulfillment of Brazil’s biofuel (sugarcane ethanol and soybean biodiesel) production targets for 2020. Image and caption from Lapola et al. 2010.
"Indirect land-use change could considerably compromise the GHG savings from growing biofuels, mainly by pushing rangeland frontier into the Amazon forest and Brazilian Cerrado savanna," Lapola and colleagues write. "In our simulations, there is an expansion of 121,970 sq km of rangeland into forest areas, and 46,000 sq km into other native habitats, due to the expansion of biofuel croplands."
Soy in Mato Grosso state, Brazil.
Oil palm plantation in Costa Rica.
The authors suggest that planting oil palm instead of sugarcane or soy on pasture lands would result in some direct deforestation (300 sq km) but significantly reduce emissions from indirect land-use change due to the crop's substantially higher oil yield.
"[We] tested different crops that could serve as feedstock to fulfill Brazil’s biodiesel demand and found that oil palm would cause the least land-use changes and associated carbon debt," they write. "Because of its high oil yield, oil palm would need only 4,200 sq km to fulfill the 2020 demand for biodiesel in Brazil. In comparison, 108,100 sq km would be needed for soybean."
Lapola and colleagues also note that restoring the productivity of Brazil's 290,000 sq km of degraded and abandoned rangeland could reduce pressure to convert native forests, thereby mitigating potential emissions.
Direct (red) and indirect (blue) land-use change to meet Brazil’s biodiesel production target for 2020 with soy and palm oil biodiesel. Adapted from Lapola et al. 2010.
Lapola and colleagues conclude by calling for "an increased interconnection between land-use sectors."
"We argue that to avoid the undesired indirect land-use change by biofuels presented here, strategies for cooperation between the cattle ranching and biofuel-growing sectors should be implemented by the biofuel sector (based on the sector’s own interest in minimizing GHG emissions), and institutional links between these two sectors should be strengthened by the government."
"In other words, biofuel organizations and the government should support initiatives toward modernization of the cattle ranching sector to guarantee that the production of biofuels is not causing ILUC, which would compromise the efficacy (in terms of carbon savings) of their own product. Such a requirement should also be considered as a standard for the production of sustainable biofuels."
Lapola et al. Indirect land-use changes can overcome carbon savings from biofuels in Brazil. PNAS Early Edition for the week of Feb 8, 2010. www.pnas.org/cgi/doi/10.1073/pnas.0907318107
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