ABSTRACT
The aim was to evaluate the impact on the variation of the energy matrix and the area of changes in land use (reforestation, afforestation and deforestation) in the reduction of greenhouse gases among the G20 member countries, in ten years 1990-2000-2010. The data envelopment analysis technique was used to calculate the scores to assess the relative efficiency of the G20 countries. The results show that changes in the energy matrix (higher consumption of less polluting sources) influence the performance in relation to other countries and that changes in land use are important factors in the country's performance in relation to himself and to others, over time.
Key words:
Efficiency; Energy; Land use; Environment