System for the use of a carbon sink consisting of land and / or forests in the European Union's Emissions Trading Scheme, which system comprises at least one computerized memory and a computer program stored in its memory, characterized in that the computer program comprises software means: for determination of the size of the carbon pool on a land and / or forest area with a certain size and a certain location with a time interval, for determining a change in the size of the carbon pool, i.e. the size of the carbon sink formed during the time interval, for storing the carbon sink size as a value for the carbon sink in a predetermined account for the carbon sink in the memory of said at least one computer, for entering personal data of the owner of the account for the carbon sink in and connecting to the account for the carbon sink, for transferring the value for the carbon sink from said first owner's account for the carbon sink in memory of at least one computer to a second owner's account for the carbon sink in the memory of said at least one computer or in the memory of a second computer, and that the system comprises an identification means for recognizing and identifying the owner of the account for the carbon sink and a reading device for reading the identification means which is connected to said at least one computer. In addition, the protection requirements 2-8.
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