They know all too well that a regulatory policy is clean environment policy, which would simply take place via a free price mechanism. How well this works, it can observe in the reduction of CO2 emissions. Politicians gave the companies, how much CO2 they can emit in the future. Freedom of choice prevails among the companies on the other hand; it is interesting how they respond to this challenge. They can invest in new innovative systems to achieve the CO2 Vorgagen. They can also to buy emission allowances on the market. The more companies opt for the latter course, the higher will be the price. At some point, then the time for any company to be achieved from investments in low-carbon technologies. They are cheaper than the constant buying allowances. In short, it comes to more market economy in energy policy would protect the environment.