As a result, greenhouse gas (GHG) emissions from energy generation and use are relatively low compared to many OECD countries. Strong economic growth in the 2000s and the rise of a middle class triggered a rapid increase in energy use, mainly in industry and transport. Nevertheless, the energy intensity of the economy (energy supply per unit of gross domestic product, GDP) remained fairly stable at levels below the OECD average. The 2010 National Climate Change Policy established an economy-wide target of limiting projected GHG emissions by between 36.1% and 38.9% by 2020.