Land-use change trajectories up to 2050insights from a global agro-economic model comparison

Resumo

Changes in agricultural land use have important implications for environmental services. Previous studies of agricultural land-use futures have been published indicating large uncertainty due to different model assumptions and methodologies. In this article we present a first comprehensive comparison of global agro-economic models that have harmonized drivers of population, GDP, and biophysical yields. The comparison allows us to ask two research questions: (1) How much cropland will be used under different socioeconomic and climate change scenarios? (2) How can differences in model results be explained? The comparison includes four partial and six general equilibrium models that differ in how they model land supply and amount of potentially available land. We analyze results of two different socioeconomic scenarios and three climate scenarios (one with constant climate). Most models (7 out of 10) project an increase of cropland of 10-25% by 2050 compared to 2005 (under constant climate), but one model projects a decrease. Pasture land expands in some models, which increase the treat on natural vegetation further. Across all models most of the cropland expansion takes place in South America and sub-Saharan Africa. In general, the strongest differences in model results are related to differences in the costs of land expansion, the endogenous productivity responses, and the assumptions about potential cropland. © 2013 International Association of Agricultural Economists.

Ficha do documento

Tipo

Artigo científico

Ano

2014

Instituição

Fundação Getulio Vargas

Fonte

Repositório da FGV

Idioma

Inglês

Acesso

Acesso restrito

DOI

10.1111/agec.12090

Identificador

oai:repositorio.fgv.br:10438/25418

Temas

EconomiaMeio Ambiente

Palavras-chave

Land expansionLand-use changeLand-use modelsModel intercomparisonClimate changeComparative studyEnvironmental economicsSocioeconomic impactSpatiotemporal analysisSouth AmericaSub-Saharan AfricaMudança no uso da terraImpacto socioeconômicoModelos de uso da terraEconomiaSolo - UsoEconomia agrícola