Generate text that refutes this claim: 450 PPM  The IPCC's Fourth Assessment Report determined that atmospheric GHG emissions needed to stabilize at 450ppm in order to avoid a temperature rise of more than 2-2.4C. Atmospheric ppm are currently at 393 and are rising at a rate of about 2 ppm per year. In order to stabilize at 450 ppm, the developed world would need to reduce its emissions by 25-40% by 2020 and 80-90% by 2050 along with significant reductions in the emissions growth rate of developing countries 1. Only a handful of countries (all of them in Europe) have achieved any reduction in annual GHG emissions despite promises to do so going back to the 1997 Kyoto Protocol.2 As a result, there is no evidence on which to reasonably conclude that atmospheric GHGs will be stabilized at 450ppm.  1. IPCC (2007). "IPCC Fourth Assessment Report: Climate Change 2007 (AR4)". Cambridge, United Kingdom and New York, NY, USA.: Cambridge University Press.  2 The Guardian, World carbon dioxide emissions data by country: China speeds ahead of the rest. (31/1/11).
climate house believes were too late global climate change
The fossil fuels which account for the majority of GHG emissions are finite resources. As oil and coal becoming increasingly scarce, markets will naturally switch to more efficient or renewable resources thus stabilizing global GHG emissions. The growth of fuel efficient hybrid and fully electric automobiles are a good example of the market responding to higher fuel prices. (Also see New Technology)