Accordingly, the target greenhouse gas emission reductions for Hungary for 2025, i.e., by the end of the current NCCS period, can be summarised as follows: in case of a unilateral mitigation by 20% by the EU: reduction by 16% to 25% from the 1990 level; in case of a comprehensive global framework scheme, that is, in case of a EU target of 30%: reduction by 27% to 34% from the 1990 level. In case of realising the conditions for the 30% emission mitigation target set by the EU, Hungary may need to buy emission offset allowances in addition to using domestic means in order to achieve its emission mitigation target for 2025. In the developing countries, the trading in emission quotas derived from more cheaply implemented emission mitigations is already in operation. Provided that the negotiations related to the international framework scheme for the period after 2012 are successfully concluded, a state purchase programme should be established still before 2012 in order to ensure that it will gather appropriate experience before starting to purchase the necessary emission quotas after 2012.