ABSTRACT
Anthropogenic greenhouse gas emissions are expected to continue to rise in the medium term and so too are atmospheric greenhouse gas concentrations. The amount of warming this century will depend on how quickly, and by how much concentrations rise, the sensitivity of global temperatures to different concentrations, and the extent of any climate change feedback effects that the warming initiates. Based on the most recent (2007) IPCC estimates, temperatures this century are likely to rise by between 2 and 5ºC (see global warming).
