Indirect Emissions from Biofuels: How Important?

TitleIndirect Emissions from Biofuels: How Important?
Publication TypeJournal Article
Year of Publication2009
AuthorsMelillo, Jerry M., Reilly J., Kicklighter David W., Gurgel Angelo, Cronin Timothy W., Paltsev S., Felzer Benjamin S., Wang X., Sokolov A. P., and C. Schlosser Adam
JournalScience
Volume326
Pagination1397 - 1399
Date Published12/2009
Keywordsbiofuels, carbon loss, greenhouse gas emissions
Abstract

A global biofuels program will lead to intense pressures on land supply and can increase greenhouse gas emissions from land-use changes. Using linked economic and terrestrial biogeochemistry models, we examined direct and indirect effects of possible land-use changes from an expanded global cellulosic bioenergy program on greenhouse gas emissions over the 21st century. Our model predicts that indirect land use will be responsible for substantially more carbon loss (up to twice as much) than direct land use; however, because of predicted increases in fertilizer use, nitrous oxide emissions will be more important than carbon losses themselves in terms of warming potential. A global greenhouse gas emissions policy that protects forests and encourages best practices for nitrogen fertilizer use can dramatically reduce emissions associated with biofuels production.