The global participation policy package sees a strong decrease in the emission of greenhouse gases. By 2030, as shown in the figure , the effect would be almost twice as large as it would be if only OECD countries implement the measures. The largest step comes with the participation of BRIC. By 2050, participation of the rest of the world will have helped to decrease emissions significantly, but even then the largest difference is created by BRIC participation.

Effect of action in OECD countries

The effect of action in OECD countries is a basic ingredient in all three cases and remains by far the largest. Obviously, the level of carbon tax determines how large the emission reduction will be. However, at a tax that gradually increases from US $25 per ton of carbon, the decrease in emissions is not enough to limit global warming to approximately 2^oC above pre-industrial level. 

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