CO-emission reduction in China's residential building sector and contribution to the national climate change mitigation targets in 2020.

Between 1980 and 2007, in the Chinese building sector in urban and rural areas, coal was mainly substituted with electricity and natural gas. Growing income will further increase energy consumption and CO-emissions in the building sector. Using an econometric model, disaggregated energy demand and related CO-emissions in the residential sector as well for the whole economy are estimated and forecasted until 2050. In 2009, the Chinese government pledged itself to reduce CO-intensity by 40%-45% in 2020 compared to 2005. Aim of this article is to assess to which extent the measures in the building sector in China can contribute to this target. Main results of the analysis are: (a) The primary energy source coal was mainly substituted by electricity generated with coal. Apart from convenience gains, the environmental advantages are questionable. (b) Between 2010 and 2050, energy demand in the building sector will grow by 2.0%-4.1% per annum leading to CO-emissions at least almost tripling from about 560 mill. tons in 2010 to about 1,500 mill. tons in 2050. (c) The energy efficiency gains in the building sector and other sectors of the Chinese economy, however, are not enough to fulfill the national CO-intensity targets. The reduction of the CO-intensity of GDP would be 37.2% in the BAU-scenario, and 31.9% in the LOW-scenario. Only in the HIGH-scenario (46.3%), the economy is growing efficient enough relative to the induced CO-emissions. The remaining CO2-emission reductions could be gained by additional promotion of renewable energies (mainly solar and geo-thermal) in the building sector. [ABSTRACT FROM AUTHOR]