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The University of Massachusetts Amherst

Indirect Emissions from Biofuels: How Important?

Authors:

Jerry Melillo

J. Reilly

David Kicklighter

Angelo Gurgel

Timothy Cronin

S. Paltsev

Benjamin Felzer

X. Wang

A. Sokolov

Adam Schlosser

+5 more
Publication Type:
Journal Article
Year of Publication:
2009
Secondary Title:
Science
Pages:
1397-1399
Volume:
326
Year:
2009
Date:
12/2009

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.