The purpose of this paper is to show that not taking into account clearing costs does not allow to describe correctly the cultivated land dynamics when food demand would require to devote to agriculture an increasing fraction of available land. We also show that the validity of the conclusions...

<np pagenum="002"/>In this paper, a partial trade equilibrium model is developed to explore the impacts of US energy policies on the use and trade of first-generation biofuels (ethanol) and second-generation biofuels (ligno-cellulosic ethanol) in the United-States and Brazil. In addition, we investigate their...

This paper studies the intertemporal substitutions between the use of renewable and non renewable resources if the productivities of the different kinds of resources are improved through time by exogenous trends of dedicated technical progress. We show that the optimal exploitation paths of the...