In order to estimate the future trends of the atmospheric levels of various greenhouse gases, and to plan carbon emission trade, it is essential to measure the carbon dioxide concentration values all over the world. In this paper the AA. analyse
University in the recent years, important regional/local conditions could be taken into account during the modelling process. In the experiments of PRECIS, three different emission scenarios (A2, A1B, B2) are considered to provide estimations for the 21st