A model of optimal car replacement is developed and used to examine the impact of alternative policy measures on the optimal car replacement time and on total emissions of pollutants, when environment policy takes the form of: (i) reduced taxes on purchaso of "clean" cars, (ii) administrative...

Global warming is expected to increase global mean temperature by 1.5 degree to 4.5 degrees sometime between 2030 et 2010, resulting in changes in the patterns of precipitation, a rise in the sea level, increased natural hazards, and other significant impacts. In this paper, I discuss the major...

The evolution of renewable resources is characterized in many cases by different time scales where some state variables such as biomass, may evolve relatively faster than other state variables such as carrying capacity. Ignoring this time scale separation means that a slowly changing variable is...

Human economies and ecosystems form a coupled system coevolving in time and space, since human economies use ecosystems services and at the same time affect ecosystems through their production and consumption activities. The study of the interactions between human economies and ecosystems is...

Renewable resource modelling is usually characterized by different time scales where some state variables such as biomass may evolve relatively faster than other state variables such as carrying capacity. Ignoring this time scale separation means that a slowly changing variable is treated as...