Latest numbers from the OECD remind us that on a PPP (purchasing power parity) basis i.e. taking into account that the cost of living in some countries is cheaper, China will become the world's largest economy before 2015. BRIC success of course is not guaranteed, with serious obstacles in the form of climate change, environmental degradation, access to resources, not to mention the political and social strains of any fast growing developing economy. Will the BRICs be able to sustain dynamic growth rates in the face of such challenges?