having regard to the difference in social costs and infrastructure costs Taxation may also be a useful instrument in controlling the greenhouse effect. Economic studies have shown that uniform regulations would lead to much greater economic losses(because the efforts are poorly distributed) than uniform taxation. However the temperature of the planet is a public good for the preservation of which the so-called"free rider" attitudes come to the fore. so far, only some OECD countries have introduced a con mission element into their tax systems e. Adoption of a joint measure throughout the ess would require better knowledge of the phenomenon in order to make the prediction of damage costs uncertain. However, on worldwide basis, adoption of similar measures by the countries of the outh would probably necessitate some efforts to redistribute wealth far beyond the transport sector.