Pig breeding industry is an important wing of the development of Hunan agricultural economy, but the corresponding environmental problems can not be ignored. Computing the carbon dioxide emissions of pig breeding, and exploring its relationship with economic development have important guiding significance for the con- stituting of energy conservation policies. Based on the hypothesis of environmental Kuznets curve model and the rel- evant statistical data of Hunan province from 1989--2013, this paper calculates the total carbon emissions of Hun...